18856558980 has 144 divisors (see below), whose sum is σ = 66197214720. Its totient is φ = 4255490304.

The previous prime is 18856558979. The next prime is 18856558991. The reversal of 18856558980 is 8985565881.

18856558980 is a `hidden beast` number, since 18 + 8 + 565 + 58 + 9 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4822 + ... + 194258.

It is an arithmetic number, because the mean of its divisors is an integer number (459702880).

Almost surely, 2^18856558980 is an apocalyptic number.

18856558980 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 18856558980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33098607360).

18856558980 is an abundant number, since it is smaller than the sum of its proper divisors (47340655740).

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

18856558980 is a wasteful number, since it uses less digits than its factorization.

18856558980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189538 (or 189533 counting only the distinct ones).

The product of its (nonzero) digits is 27648000, while the sum is 63.

The spelling of 18856558980 in words is "eighteen billion, eight hundred fifty-six million, five hundred fifty-eight thousand, nine hundred eighty".