77156522768 has 120 divisors (see below), whose sum is σ = 166983348096. Its totient is φ = 34502208000.

The previous prime is 77156522741. The next prime is 77156522771. The reversal of 77156522768 is 86722565177.

Its product of digits (9878400) is a multiple of the sum of its prime divisors (6174).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12832883 + ... + 12838893.

Almost surely, 2^77156522768 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77156522768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83491674048).

77156522768 is an abundant number, since it is smaller than the sum of its proper divisors (89826825328).

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

77156522768 is a wasteful number, since it uses less digits than its factorization.

77156522768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6193 (or 6174 counting only the distinct ones).

The product of its digits is 9878400, while the sum is 56.

The spelling of 77156522768 in words is "seventy-seven billion, one hundred fifty-six million, five hundred twenty-two thousand, seven hundred sixty-eight".