18140806656 has 600 divisors, whose sum is σ = 64347354720. Its totient is φ = 5072191488.

The previous prime is 18140806603. The next prime is 18140806751. The reversal of 18140806656 is 65660804181.

18140806656 is a `hidden beast` number, since 181 + 408 + 0 + 6 + 65 + 6 = 666.

It is a super-2 number, since 2×18140806656² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 160538056 + ... + 160538168.

Almost surely, 2^18140806656 is an apocalyptic number.

18140806656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18140806656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32173677360).

18140806656 is an abundant number, since it is smaller than the sum of its proper divisors (46206548064).

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

18140806656 is an equidigital number, since it uses as much as digits as its factorization.

18140806656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236 (or 204 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The spelling of 18140806656 in words is "eighteen billion, one hundred forty million, eight hundred six thousand, six hundred fifty-six".