664364587 has 2 divisors, whose sum is σ = 664364588. Its totient is φ = 664364586.

The previous prime is 664364579. The next prime is 664364609. The reversal of 664364587 is 785463466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664364587 - 2³ = 664364579 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 664364587.

It is not a weakly prime, because it can be changed into another prime (664364527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332182293 + 332182294.

It is an arithmetic number, because the mean of its divisors is an integer number (332182294).

Almost surely, 2^664364587 is an apocalyptic number.

664364587 is a deficient number, since it is larger than the sum of its proper divisors (1).

664364587 is an equidigital number, since it uses as much as digits as its factorization.

664364587 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2903040, while the sum is 49.

The square root of 664364587 is about 25775.2708424179. The cubic root of 664364587 is about 872.5737791979.

The spelling of 664364587 in words is "six hundred sixty-four million, three hundred sixty-four thousand, five hundred eighty-seven".