18180616356 has 72 divisors (see below), whose sum is σ = 52660637120. Its totient is φ = 5180728896.

The previous prime is 18180616327. The next prime is 18180616379. The reversal of 18180616356 is 65361608181.

18180616356 is a `hidden beast` number, since 1 + 8 + 1 + 8 + 0 + 6 + 1 + 635 + 6 = 666.

It is a super-2 number, since 2×18180616356² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 330 + ... + 190686.

Almost surely, 2^18180616356 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18180616356, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26330318560).

18180616356 is an abundant number, since it is smaller than the sum of its proper divisors (34480020764).

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

18180616356 is a wasteful number, since it uses less digits than its factorization.

18180616356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190753 (or 190748 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The spelling of 18180616356 in words is "eighteen billion, one hundred eighty million, six hundred sixteen thousand, three hundred fifty-six".