2166564111664 has 20 divisors (see below), whose sum is σ = 4225890574800. Its totient is φ = 1076011705280.

The previous prime is 2166564111643. The next prime is 2166564111689. The reversal of 2166564111664 is 4661114656612.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 454394452 + ... + 454399219.

It is an arithmetic number, because the mean of its divisors is an integer number (211294528740).

Almost surely, 2^{2166564111664} is an apocalyptic number.

It is an amenable number.

2166564111664 is a deficient number, since it is larger than the sum of its proper divisors (2059326463136).

2166564111664 is a wasteful number, since it uses less digits than its factorization.

2166564111664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 908793828 (or 908793822 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 49.

The spelling of 2166564111664 in words is "two trillion, one hundred sixty-six billion, five hundred sixty-four million, one hundred eleven thousand, six hundred sixty-four".