18056656800 has 1296 divisors, whose sum is σ = 82986688512. Its totient is φ = 3657830400.

The previous prime is 18056656781. The next prime is 18056656819. The reversal of 18056656800 is 865665081.

18056656800 is a `hidden beast` number, since 1 + 8 + 0 + 566 + 5 + 6 + 80 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (18056656781) and next prime (18056656819).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 215 ways as a sum of consecutive naturals, for example, 142178337 + ... + 142178463.

Almost surely, 2^18056656800 is an apocalyptic number.

18056656800 is a gapful number since it is divisible by the number (10) 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 18056656800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41493344256).

18056656800 is an abundant number, since it is smaller than the sum of its proper divisors (64930031712).

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

18056656800 is a wasteful number, since it uses less digits than its factorization.

18056656800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211 (or 188 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 45.

The spelling of 18056656800 in words is "eighteen billion, fifty-six million, six hundred fifty-six thousand, eight hundred".