77558794656 has 144 divisors (see below), whose sum is σ = 249296412960. Its totient is φ = 20993333760.

The previous prime is 77558794639. The next prime is 77558794669. The reversal of 77558794656 is 65649785577.

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, 344515 + ... + 523266.

It is an arithmetic number, because the mean of its divisors is an integer number (1731225090).

Almost surely, 2^77558794656 is an apocalyptic number.

77558794656 is a gapful number since it is divisible by the number (76) formed by its first and last digit.

It is an amenable number.

77558794656 is an abundant number, since it is smaller than the sum of its proper divisors (171737618304).

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

77558794656 is a wasteful number, since it uses less digits than its factorization.

77558794656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867827 (or 867812 counting only the distinct ones).

The product of its digits is 444528000, while the sum is 69.

The spelling of 77558794656 in words is "seventy-seven billion, five hundred fifty-eight million, seven hundred ninety-four thousand, six hundred fifty-six".