20166516400 has 60 divisors (see below), whose sum is σ = 51000077800. Its totient is φ = 7642045440.

The previous prime is 20166516353. The next prime is 20166516413. The reversal of 20166516400 is 461566102.

It is a super-2 number, since 2×20166516400² (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 11 ways as a sum of consecutive naturals, for example, 1319145 + ... + 1334344.

Almost surely, 2^20166516400 is an apocalyptic number.

20166516400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20166516400 is an abundant number, since it is smaller than the sum of its proper divisors (30833561400).

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

20166516400 is a wasteful number, since it uses less digits than its factorization.

20166516400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2653526 (or 2653515 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The spelling of 20166516400 in words is "twenty billion, one hundred sixty-six million, five hundred sixteen thousand, four hundred".