2155657513 has 4 divisors (see below), whose sum is σ = 2155916800. Its totient is φ = 2155398228.

The previous prime is 2155657501. The next prime is 2155657529. The reversal of 2155657513 is 3157565512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2155657513 - 2²¹ = 2153560361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2155657913) 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, 116745 + ... + 133942.

It is an arithmetic number, because the mean of its divisors is an integer number (538979200).

Almost surely, 2^2155657513 is an apocalyptic number.

It is an amenable number.

2155657513 is a deficient number, since it is larger than the sum of its proper divisors (259287).

2155657513 is an equidigital number, since it uses as much as digits as its factorization.

2155657513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259286.

The product of its digits is 157500, while the sum is 40.

The square root of 2155657513 is about 46429.0589286494. The cubic root of 2155657513 is about 1291.7939731690.

The spelling of 2155657513 in words is "two billion, one hundred fifty-five million, six hundred fifty-seven thousand, five hundred thirteen".