78517968794 has 16 divisors (see below), whose sum is σ = 119780369088. Its totient is φ = 38593586592.

The previous prime is 78517968779. The next prime is 78517968803. The reversal of 78517968794 is 49786971587.

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, 536339 + ... + 666854.

It is an arithmetic number, because the mean of its divisors is an integer number (7486273068).

Almost surely, 2^78517968794 is an apocalyptic number.

78517968794 is a deficient number, since it is larger than the sum of its proper divisors (41262400294).

78517968794 is a wasteful number, since it uses less digits than its factorization.

78517968794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1203749.

The product of its digits is 213373440, while the sum is 71.

The spelling of 78517968794 in words is "seventy-eight billion, five hundred seventeen million, nine hundred sixty-eight thousand, seven hundred ninety-four".