18541868374656 has 128 divisors (see below), whose sum is σ = 59699197540800. Its totient is φ = 5618747980800.

The previous prime is 18541868374607. The next prime is 18541868374663. The reversal of 18541868374656 is 65647386814581.

18541868374656 is a `hidden beast` number, since 1 + 8 + 5 + 4 + 1 + 86 + 83 + 7 + 465 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Smith number, since the sum of its digits (72) coincides with the sum of the digits of its prime factors.

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

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, 243831255 + ... + 243907286.

Almost surely, 2^{18541868374656} is an apocalyptic number.

18541868374656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18541868374656 is an abundant number, since it is smaller than the sum of its proper divisors (41157329166144).

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

18541868374656 is a wasteful number, since it uses less digits than its factorization.

18541868374656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487738575 (or 487738557 counting only the distinct ones).

The product of its digits is 928972800, while the sum is 72.

The spelling of 18541868374656 in words is "eighteen trillion, five hundred forty-one billion, eight hundred sixty-eight million, three hundred seventy-four thousand, six hundred fifty-six".