2157664659 has 16 divisors (see below), whose sum is σ = 2900364288. Its totient is φ = 1426737312.

The previous prime is 2157664627. The next prime is 2157664727. The reversal of 2157664659 is 9564667512.

It is not a de Polignac number, because 2157664659 - 2⁵ = 2157664627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2157664559) 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, 282124 + ... + 289670.

It is an arithmetic number, because the mean of its divisors is an integer number (181272768).

Almost surely, 2^2157664659 is an apocalyptic number.

2157664659 is a deficient number, since it is larger than the sum of its proper divisors (742699629).

2157664659 is a wasteful number, since it uses less digits than its factorization.

2157664659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8314.

The product of its digits is 2721600, while the sum is 51.

The square root of 2157664659 is about 46450.6690909830. The cubic root of 2157664659 is about 1292.1947812406.

The spelling of 2157664659 in words is "two billion, one hundred fifty-seven million, six hundred sixty-four thousand, six hundred fifty-nine".