2157664559 has 2 divisors, whose sum is σ = 2157664560. Its totient is φ = 2157664558.

The previous prime is 2157664507. The next prime is 2157664589. The reversal of 2157664559 is 9554667512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2157664559 - 2²⁸ = 1889229103 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2157664589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078832279 + 1078832280.

It is an arithmetic number, because the mean of its divisors is an integer number (1078832280).

Almost surely, 2^2157664559 is an apocalyptic number.

2157664559 is a deficient number, since it is larger than the sum of its proper divisors (1).

2157664559 is an equidigital number, since it uses as much as digits as its factorization.

2157664559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2268000, while the sum is 50.

The square root of 2157664559 is about 46450.6680145722. The cubic root of 2157664559 is about 1292.1947612777.

The spelling of 2157664559 in words is "two billion, one hundred fifty-seven million, six hundred sixty-four thousand, five hundred fifty-nine".