78695659687 has 4 divisors (see below), whose sum is σ = 79022197936. Its totient is φ = 78369121440.

The previous prime is 78695659619. The next prime is 78695659709.

78695659687 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78695659687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78695657687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163268763 + ... + 163269244.

It is an arithmetic number, because the mean of its divisors is an integer number (19755549484).

Almost surely, 2^78695659687 is an apocalyptic number.

78695659687 is a deficient number, since it is larger than the sum of its proper divisors (326538249).

78695659687 is a wasteful number, since it uses less digits than its factorization.

78695659687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326538248.

The product of its digits is 1371686400, while the sum is 76.

The spelling of 78695659687 in words is "seventy-eight billion, six hundred ninety-five million, six hundred fifty-nine thousand, six hundred eighty-seven".