2157664495 has 16 divisors (see below), whose sum is σ = 2960059968. Its totient is φ = 1479052800.

The previous prime is 2157664493. The next prime is 2157664507. The reversal of 2157664495 is 5944667512.

2157664495 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2157664495 - 2¹ = 2157664493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157664493) 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, 121207 + ... + 137863.

It is an arithmetic number, because the mean of its divisors is an integer number (185003748).

Almost surely, 2^2157664495 is an apocalyptic number.

2157664495 is a deficient number, since it is larger than the sum of its proper divisors (802395473).

2157664495 is a wasteful number, since it uses less digits than its factorization.

2157664495 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20370.

The product of its digits is 1814400, while the sum is 49.

The square root of 2157664495 is about 46450.6673256693. The cubic root of 2157664495 is about 1292.1947485015.

The spelling of 2157664495 in words is "two billion, one hundred fifty-seven million, six hundred sixty-four thousand, four hundred ninety-five".