664987039 has 2 divisors, whose sum is σ = 664987040. Its totient is φ = 664987038.

The previous prime is 664987031. The next prime is 664987123. The reversal of 664987039 is 930789466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664987039 - 2³ = 664987031 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664987031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332493519 + 332493520.

It is an arithmetic number, because the mean of its divisors is an integer number (332493520).

Almost surely, 2^664987039 is an apocalyptic number.

664987039 is a deficient number, since it is larger than the sum of its proper divisors (1).

664987039 is an equidigital number, since it uses as much as digits as its factorization.

664987039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1959552, while the sum is 52.

The square root of 664987039 is about 25787.3426122197. The cubic root of 664987039 is about 872.8462027885.

It can be divided in two parts, 66498 and 7039, that added together give a palindrome (73537).

The spelling of 664987039 in words is "six hundred sixty-four million, nine hundred eighty-seven thousand, thirty-nine".