664417654925 has 6 divisors (see below), whose sum is σ = 823877892138. Its totient is φ = 531534123920.

The previous prime is 664417654919. The next prime is 664417654933. The reversal of 664417654925 is 529456714466.

It can be written as a sum of positive squares in 3 ways, for example, as 36565853284 + 627851801641 = 191222^2 + 792371^2 .

It is not a de Polignac number, because 664417654925 - 2⁸ = 664417654669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13288353074 + ... + 13288353123.

It is an arithmetic number, because the mean of its divisors is an integer number (137312982023).

Almost surely, 2^664417654925 is an apocalyptic number.

It is an amenable number.

664417654925 is a deficient number, since it is larger than the sum of its proper divisors (159460237213).

664417654925 is a wasteful number, since it uses less digits than its factorization.

664417654925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26576706207 (or 26576706202 counting only the distinct ones).

The product of its digits is 43545600, while the sum is 59.

The spelling of 664417654925 in words is "six hundred sixty-four billion, four hundred seventeen million, six hundred fifty-four thousand, nine hundred twenty-five".