2157665232 has 120 divisors (see below), whose sum is σ = 5918728320. Its totient is φ = 677214720.

The previous prime is 2157665231. The next prime is 2157665233. The reversal of 2157665232 is 2325667512.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2157665231) and next prime (2157665233).

It is a super-2 number, since 2×2157665232² = 9311038506763227648, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157665231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4141132 + ... + 4141652.

It is an arithmetic number, because the mean of its divisors is an integer number (49322736).

Almost surely, 2^2157665232 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2157665232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2959364160).

2157665232 is an abundant number, since it is smaller than the sum of its proper divisors (3761063088).

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

2157665232 is a wasteful number, since it uses less digits than its factorization.

2157665232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 809 (or 784 counting only the distinct ones).

The product of its digits is 151200, while the sum is 39.

The square root of 2157665232 is about 46450.6752588162. The cubic root of 2157665232 is about 1292.1948956277.

The spelling of 2157665232 in words is "two billion, one hundred fifty-seven million, six hundred sixty-five thousand, two hundred thirty-two".