2112457021566 has 64 divisors (see below), whose sum is σ = 4278393907200. Its totient is φ = 695299055616.

The previous prime is 2112457021553. The next prime is 2112457021573. The reversal of 2112457021566 is 6651207542112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 258274065 + ... + 258282243.

It is an arithmetic number, because the mean of its divisors is an integer number (66849904800).

Almost surely, 2^{2112457021566} is an apocalyptic number.

2112457021566 is an abundant number, since it is smaller than the sum of its proper divisors (2165936885634).

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

2112457021566 is a wasteful number, since it uses less digits than its factorization.

2112457021566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9953.

The product of its (nonzero) digits is 201600, while the sum is 42.

The spelling of 2112457021566 in words is "two trillion, one hundred twelve billion, four hundred fifty-seven million, twenty-one thousand, five hundred sixty-six".