77585994321912 has 160 divisors (see below), whose sum is σ = 231639989922000. Its totient is φ = 24177343159296.

The previous prime is 77585994321889. The next prime is 77585994322021. The reversal of 77585994321912 is 21912349958577.

It is a happy number.

77585994321912 is a `hidden beast` number, since 7 + 7 + 5 + 8 + 599 + 4 + 3 + 2 + 19 + 12 = 666.

It is a super-2 number, since 2×77585994321912² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 21992938 + ... + 25275705.

Almost surely, 2^{77585994321912} is an apocalyptic number.

77585994321912 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

77585994321912 is an abundant number, since it is smaller than the sum of its proper divisors (154053995600088).

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

77585994321912 is a wasteful number, since it uses less digits than its factorization.

77585994321912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47268827 (or 47268814 counting only the distinct ones).

The product of its digits is 342921600, while the sum is 72.

The spelling of 77585994321912 in words is "seventy-seven trillion, five hundred eighty-five billion, nine hundred ninety-four million, three hundred twenty-one thousand, nine hundred twelve".