2157664589 has 2 divisors, whose sum is σ = 2157664590. Its totient is φ = 2157664588.

The previous prime is 2157664559. The next prime is 2157664591. The reversal of 2157664589 is 9854667512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2086936489 + 70728100 = 45683^2 + 8410^2 .

It is a cyclic number.

It is not a de Polignac number, because 2157664589 - 2²⁰ = 2156616013 is a prime.

Together with 2157664591, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2157664589.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2157664559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078832294 + 1078832295.

It is an arithmetic number, because the mean of its divisors is an integer number (1078832295).

Almost surely, 2^2157664589 is an apocalyptic number.

It is an amenable number.

2157664589 is a deficient number, since it is larger than the sum of its proper divisors (1).

2157664589 is an equidigital number, since it uses as much as digits as its factorization.

2157664589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3628800, while the sum is 53.

The square root of 2157664589 is about 46450.6683374954. The cubic root of 2157664589 is about 1292.1947672666.

The spelling of 2157664589 in words is "two billion, one hundred fifty-seven million, six hundred sixty-four thousand, five hundred eighty-nine".