68719476817 has 8 divisors (see below), whose sum is σ = 69499294920. Its totient is φ = 67939829760.

The previous prime is 68719476767. The next prime is 68719476851. The reversal of 68719476817 is 71867491786.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 81 + 68719476736 = 9^2 + 262144^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68719476817 is a prime.

It is a super-4 number, since 4×68719476817⁴ (a number of 44 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68719473817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 876717 + ... + 951877.

It is an arithmetic number, because the mean of its divisors is an integer number (8687411865).

Almost surely, 2^68719476817 is an apocalyptic number.

It is an amenable number.

68719476817 is a deficient number, since it is larger than the sum of its proper divisors (779818103).

68719476817 is a wasteful number, since it uses less digits than its factorization.

68719476817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85523.

The product of its digits is 28449792, while the sum is 64.

The spelling of 68719476817 in words is "sixty-eight billion, seven hundred nineteen million, four hundred seventy-six thousand, eight hundred seventeen".