Base | Representation |
---|---|
bin | 111110001100000100… |
… | …111110010110011101 |
3 | 20101100122020100022002 |
4 | 332030010332112131 |
5 | 2043223300424040 |
6 | 50401551532045 |
7 | 4552510636022 |
oct | 761404762635 |
9 | 211318210262 |
10 | 66774623645 |
11 | 26356597084 |
12 | 10b3682a025 |
13 | 63b2162532 |
14 | 3336503549 |
15 | 1b0c39da15 |
hex | f8c13e59d |
66774623645 has 4 divisors (see below), whose sum is σ = 80129548380. Its totient is φ = 53419698912.
The previous prime is 66774623633. The next prime is 66774623653. The reversal of 66774623645 is 54632647766.
It is a semiprime because it is the product of two primes.
It can be written as a sum of positive squares in 2 ways, for example, as 42690997924 + 24083625721 = 206618^2 + 155189^2 .
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-66774623645 is a prime.
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6677462360 + ... + 6677462369.
It is an arithmetic number, because the mean of its divisors is an integer number (20032387095).
Almost surely, 266774623645 is an apocalyptic number.
It is an amenable number.
66774623645 is a deficient number, since it is larger than the sum of its proper divisors (13354924735).
66774623645 is a wasteful number, since it uses less digits than its factorization.
66774623645 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 13354924734.
The product of its digits is 30481920, while the sum is 56.
The spelling of 66774623645 in words is "sixty-six billion, seven hundred seventy-four million, six hundred twenty-three thousand, six hundred forty-five".
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