78917902816 has 24 divisors (see below), whose sum is σ = 155377122264. Its totient is φ = 39457046400.

The previous prime is 78917902799. The next prime is 78917902897. The reversal of 78917902816 is 61820971987.

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, 808251 + ... + 900613.

It is an arithmetic number, because the mean of its divisors is an integer number (6474046761).

Almost surely, 2^78917902816 is an apocalyptic number.

It is an amenable number.

78917902816 is a deficient number, since it is larger than the sum of its proper divisors (76459219448).

78917902816 is a wasteful number, since it uses less digits than its factorization.

78917902816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119074 (or 119066 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 58.

The spelling of 78917902816 in words is "seventy-eight billion, nine hundred seventeen million, nine hundred two thousand, eight hundred sixteen".