2157651256 has 16 divisors (see below), whose sum is σ = 4048725240. Its totient is φ = 1077991200.

The previous prime is 2157651241. The next prime is 2157651259. The reversal of 2157651256 is 6521567512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157651259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93246 + ... + 114061.

Almost surely, 2^2157651256 is an apocalyptic number.

It is an amenable number.

2157651256 is a deficient number, since it is larger than the sum of its proper divisors (1891073984).

2157651256 is a wasteful number, since it uses less digits than its factorization.

2157651256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208614 (or 208610 counting only the distinct ones).

The product of its digits is 126000, while the sum is 40.

The square root of 2157651256 is about 46450.5248194248. The cubic root of 2157651256 is about 1292.1921056128.

The spelling of 2157651256 in words is "two billion, one hundred fifty-seven million, six hundred fifty-one thousand, two hundred fifty-six".