18918010566 has 160 divisors (see below), whose sum is σ = 52336468800. Its totient is φ = 4973716224.

The previous prime is 18918010511. The next prime is 18918010583. The reversal of 18918010566 is 66501081981.

18918010566 is a `hidden beast` number, since 1 + 8 + 9 + 1 + 80 + 1 + 0 + 566 = 666.

It is a super-2 number, since 2×18918010566² (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 79 ways as a sum of consecutive naturals, for example, 5143120 + ... + 5146796.

It is an arithmetic number, because the mean of its divisors is an integer number (327102930).

Almost surely, 2^18918010566 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18918010566, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26168234400).

18918010566 is an abundant number, since it is smaller than the sum of its proper divisors (33418458234).

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

18918010566 is a wasteful number, since it uses less digits than its factorization.

18918010566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4060 (or 4051 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 45.

The spelling of 18918010566 in words is "eighteen billion, nine hundred eighteen million, ten thousand, five hundred sixty-six".