77715389994 has 16 divisors (see below), whose sum is σ = 169560851040. Its totient is φ = 23550118160.

The previous prime is 77715389971. The next prime is 77715390001. The reversal of 77715389994 is 49998351777.

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, 588752889 + ... + 588753020.

It is an arithmetic number, because the mean of its divisors is an integer number (10597553190).

Almost surely, 2^77715389994 is an apocalyptic number.

77715389994 is an abundant number, since it is smaller than the sum of its proper divisors (91845461046).

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

77715389994 is a wasteful number, since it uses less digits than its factorization.

77715389994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1177505925.

The product of its digits is 120022560, while the sum is 69.

The spelling of 77715389994 in words is "seventy-seven billion, seven hundred fifteen million, three hundred eighty-nine thousand, nine hundred ninety-four".