68815656875 has 20 divisors (see below), whose sum is σ = 98276628912. Its totient is φ = 47187876000.

The previous prime is 68815656857. The next prime is 68815656883. The reversal of 68815656875 is 57865651886.

It is a de Polignac number, because none of the positive numbers 2^k-68815656875 is a prime.

It is a super-2 number, since 2×68815656875² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (65) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 7860272 + ... + 7869021.

Almost surely, 2^68815656875 is an apocalyptic number.

68815656875 is a deficient number, since it is larger than the sum of its proper divisors (29460972037).

68815656875 is an equidigital number, since it uses as much as digits as its factorization.

68815656875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15729320 (or 15729305 counting only the distinct ones).

The product of its digits is 96768000, while the sum is 65.

The spelling of 68815656875 in words is "sixty-eight billion, eight hundred fifteen million, six hundred fifty-six thousand, eight hundred seventy-five".