77990021718596 has 48 divisors (see below), whose sum is σ = 155692185962544. Its totient is φ = 33863860432896.

The previous prime is 77990021718589. The next prime is 77990021718601. The reversal of 77990021718596 is 69581712009977.

It can be written as a sum of positive squares in 8 ways, for example, as 8433587716096 + 69556434002500 = 2904064^2 + 8340050^2 .

It is a super-2 number, since 2×77990021718596² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16318355 + ... + 20549178.

It is an arithmetic number, because the mean of its divisors is an integer number (3243587207553).

Almost surely, 2^{77990021718596} is an apocalyptic number.

It is an amenable number.

77990021718596 is a deficient number, since it is larger than the sum of its proper divisors (77702164243948).

77990021718596 is a wasteful number, since it uses less digits than its factorization.

77990021718596 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36869960 (or 36869958 counting only the distinct ones).

The product of its (nonzero) digits is 120022560, while the sum is 71.

The spelling of 77990021718596 in words is "seventy-seven trillion, nine hundred ninety billion, twenty-one million, seven hundred eighteen thousand, five hundred ninety-six".