18138898553868 has 36 divisors (see below), whose sum is σ = 45864105028560. Its totient is φ = 6044585186016.

The previous prime is 18138898553803. The next prime is 18138898553929. The reversal of 18138898553868 is 86835589883181.

18138898553868 is a `hidden beast` number, since 1 + 8 + 13 + 8 + 8 + 9 + 8 + 5 + 538 + 68 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×18138898553868² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71301763 + ... + 71555706.

It is an arithmetic number, because the mean of its divisors is an integer number (1274002917460).

Almost surely, 2^{18138898553868} is an apocalyptic number.

18138898553868 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18138898553868 is an abundant number, since it is smaller than the sum of its proper divisors (27725206474692).

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

18138898553868 is a wasteful number, since it uses less digits than its factorization.

18138898553868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142861006 (or 142861001 counting only the distinct ones).

The product of its digits is 3185049600, while the sum is 81.

The spelling of 18138898553868 in words is "eighteen trillion, one hundred thirty-eight billion, eight hundred ninety-eight million, five hundred fifty-three thousand, eight hundred sixty-eight".