2166387372 has 36 divisors (see below), whose sum is σ = 5764365880. Its totient is φ = 684122112.

The previous prime is 2166387337. The next prime is 2166387389. The reversal of 2166387372 is 2737836612.

2166387372 is a `hidden beast` number, since 2 + 1 + 6 + 638 + 7 + 3 + 7 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×2166387372² = 9386468491122132768, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1582933 + ... + 1584300.

Almost surely, 2^2166387372 is an apocalyptic number.

It is an amenable number.

2166387372 is an abundant number, since it is smaller than the sum of its proper divisors (3597978508).

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

2166387372 is a wasteful number, since it uses less digits than its factorization.

2166387372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3167262 (or 3167257 counting only the distinct ones).

The product of its digits is 508032, while the sum is 45.

The square root of 2166387372 is about 46544.4666098990. The cubic root of 2166387372 is about 1293.9337430551.

The spelling of 2166387372 in words is "two billion, one hundred sixty-six million, three hundred eighty-seven thousand, three hundred seventy-two".