2166057567784 has 32 divisors (see below), whose sum is σ = 4431646598400. Its totient is φ = 984332888320.

The previous prime is 2166057567749. The next prime is 2166057567811. The reversal of 2166057567784 is 4877657506612.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2618929 + ... + 3345280.

It is an arithmetic number, because the mean of its divisors is an integer number (138488956200).

Almost surely, 2^{2166057567784} is an apocalyptic number.

It is an amenable number.

2166057567784 is an abundant number, since it is smaller than the sum of its proper divisors (2265589030616).

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

2166057567784 is a wasteful number, since it uses less digits than its factorization.

2166057567784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5968353 (or 5968349 counting only the distinct ones).

The product of its (nonzero) digits is 118540800, while the sum is 64.

The spelling of 2166057567784 in words is "two trillion, one hundred sixty-six billion, fifty-seven million, five hundred sixty-seven thousand, seven hundred eighty-four".