2166323240564 has 24 divisors (see below), whose sum is σ = 4449745036800. Its totient is φ = 903331698336.

The previous prime is 2166323240551. The next prime is 2166323240647. The reversal of 2166323240564 is 4650423236612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1045521764 + ... + 1045523835.

It is an arithmetic number, because the mean of its divisors is an integer number (185406043200).

Almost surely, 2^{2166323240564} is an apocalyptic number.

It is an amenable number.

2166323240564 is an abundant number, since it is smaller than the sum of its proper divisors (2283421796236).

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

2166323240564 is a wasteful number, since it uses less digits than its factorization.

2166323240564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2091045647 (or 2091045645 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 44.

The spelling of 2166323240564 in words is "two trillion, one hundred sixty-six billion, three hundred twenty-three million, two hundred forty thousand, five hundred sixty-four".