78666931968 has 72 divisors (see below), whose sum is σ = 211721403600. Its totient is φ = 25927655424.

The previous prime is 78666931951. The next prime is 78666931997. The reversal of 78666931968 is 86913966687.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 507103 + ... + 643806.

It is an arithmetic number, because the mean of its divisors is an integer number (2940575050).

Almost surely, 2^78666931968 is an apocalyptic number.

It is an amenable number.

78666931968 is an abundant number, since it is smaller than the sum of its proper divisors (133054471632).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78666931968 is a wasteful number, since it uses less digits than its factorization.

78666931968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1151017 (or 1151003 counting only the distinct ones).

The product of its digits is 141087744, while the sum is 69.

The spelling of 78666931968 in words is "seventy-eight billion, six hundred sixty-six million, nine hundred thirty-one thousand, nine hundred sixty-eight".