2166145156 has 24 divisors (see below), whose sum is σ = 4420707200. Its totient is φ = 928347336.

The previous prime is 2166145123. The next prime is 2166145183. The reversal of 2166145156 is 6515416612.

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, 788040 + ... + 790783.

Almost surely, 2^2166145156 is an apocalyptic number.

It is an amenable number.

2166145156 is an abundant number, since it is smaller than the sum of its proper divisors (2254562044).

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

2166145156 is a wasteful number, since it uses less digits than its factorization.

2166145156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1578848 (or 1578832 counting only the distinct ones).

The product of its digits is 43200, while the sum is 37.

The square root of 2166145156 is about 46541.8645522502. The cubic root of 2166145156 is about 1293.8855178945.

The spelling of 2166145156 in words is "two billion, one hundred sixty-six million, one hundred forty-five thousand, one hundred fifty-six".