| Base | Representation |
|---|---|
| bin | 111111111111111111… |
| … | …000000000000000001 |
| 3 | 20120101011022210121001 |
| 4 | 333333333000000001 |
| 5 | 2111214104331333 |
| 6 | 51322535132001 |
| 7 | 4651632454261 |
| oct | 777777000001 |
| 9 | 216334283531 |
| 10 | 68719214593 |
| 11 | 27164229037 |
| 12 | 11399b14001 |
| 13 | 6631ca9473 |
| 14 | 347c8977a1 |
| 15 | 1bc2e68b7d |
| hex | ffffc0001 |
68719214593 has 4 divisors (see below), whose sum is σ = 68719739908. Its totient is φ = 68718689280.
The previous prime is 68719214591. The next prime is 68719214617. The reversal of 68719214593 is 39541291786.
It is a happy number.
It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 39541291786 = 2 ⋅19770645893.
It can be written as a sum of positive squares in 2 ways, for example, as 68451826689 + 267387904 = 261633^2 + 16352^2 .
It is a cyclic number.
It is not a de Polignac number, because 68719214593 - 21 = 68719214591 is a prime.
It is a super-4 number, since 4×687192145934 (a number of 44 digits) contains 4444 as substring.
It is the 262144-th Hogben number.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (68719214591) by changing a digit.
It is a nontrivial repunit in base 262143.
It is a pernicious number, because its binary representation contains a prime number (19) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106705 + ... + 385777.
It is an arithmetic number, because the mean of its divisors is an integer number (17179934977).
It is a Proth number, since it is equal to 262143 ⋅ 218 + 1 and 262143 < 218.
It is a Poulet number, since it divides 268719214592-1.
Almost surely, 268719214593 is an apocalyptic number.
It is an amenable number.
68719214593 is a deficient number, since it is larger than the sum of its proper divisors (525315).
68719214593 is a wasteful number, since it uses less digits than its factorization.
68719214593 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 525314.
The product of its digits is 3265920, while the sum is 55.
The spelling of 68719214593 in words is "sixty-eight billion, seven hundred nineteen million, two hundred fourteen thousand, five hundred ninety-three".
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