2166165784 has 8 divisors (see below), whose sum is σ = 4061560860. Its totient is φ = 1083082888.

The previous prime is 2166165769. The next prime is 2166165839. The reversal of 2166165784 is 4875616612.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 135385354 + ... + 135385369.

Almost surely, 2^2166165784 is an apocalyptic number.

It is an amenable number.

2166165784 is a deficient number, since it is larger than the sum of its proper divisors (1895395076).

2166165784 is a wasteful number, since it uses less digits than its factorization.

2166165784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270770729 (or 270770725 counting only the distinct ones).

The product of its digits is 483840, while the sum is 46.

The square root of 2166165784 is about 46542.0861586586. The cubic root of 2166165784 is about 1293.8896250655.

The spelling of 2166165784 in words is "two billion, one hundred sixty-six million, one hundred sixty-five thousand, seven hundred eighty-four".