18397816834656 has 96 divisors (see below), whose sum is σ = 55709277361920. Its totient is φ = 5207392728576.

The previous prime is 18397816834619. The next prime is 18397816834693. The reversal of 18397816834656 is 65643861879381.

It is an interprime number because it is at equal distance from previous prime (18397816834619) and next prime (18397816834693).

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127861291 + ... + 128005098.

It is an arithmetic number, because the mean of its divisors is an integer number (580304972520).

Almost surely, 2^{18397816834656} is an apocalyptic number.

18397816834656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18397816834656 is an abundant number, since it is smaller than the sum of its proper divisors (37311460527264).

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

18397816834656 is a wasteful number, since it uses less digits than its factorization.

18397816834656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255866516 (or 255866508 counting only the distinct ones).

The product of its digits is 1254113280, while the sum is 75.

The spelling of 18397816834656 in words is "eighteen trillion, three hundred ninety-seven billion, eight hundred sixteen million, eight hundred thirty-four thousand, six hundred fifty-six".