77889977915 has 8 divisors (see below), whose sum is σ = 93474585168. Its totient is φ = 62307574560.

The previous prime is 77889977909. The next prime is 77889977929. The reversal of 77889977915 is 51977998877.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-77889977915 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 472196 + ... + 615425.

It is an arithmetic number, because the mean of its divisors is an integer number (11684323146).

Almost surely, 2^77889977915 is an apocalyptic number.

77889977915 is a deficient number, since it is larger than the sum of its proper divisors (15584607253).

77889977915 is a wasteful number, since it uses less digits than its factorization.

77889977915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101949.

The product of its digits is 560105280, while the sum is 77.

The spelling of 77889977915 in words is "seventy-seven billion, eight hundred eighty-nine million, nine hundred seventy-seven thousand, nine hundred fifteen".