2156537523 has 16 divisors (see below), whose sum is σ = 3429029376. Its totient is φ = 1178728320.

The previous prime is 2156537521. The next prime is 2156537531. The reversal of 2156537523 is 3257356512.

It is not a de Polignac number, because 2156537523 - 2¹ = 2156537521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2156537521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2231958 + ... + 2232923.

It is an arithmetic number, because the mean of its divisors is an integer number (214314336).

Almost surely, 2^2156537523 is an apocalyptic number.

2156537523 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

2156537523 is a deficient number, since it is larger than the sum of its proper divisors (1272491853).

2156537523 is a wasteful number, since it uses less digits than its factorization.

2156537523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4464914.

The product of its digits is 189000, while the sum is 39.

The square root of 2156537523 is about 46438.5348929098. The cubic root of 2156537523 is about 1291.9697334573.

The spelling of 2156537523 in words is "two billion, one hundred fifty-six million, five hundred thirty-seven thousand, five hundred twenty-three".