664136325 has 18 divisors (see below), whose sum is σ = 1189542354. Its totient is φ = 354205920.

The previous prime is 664136287. The next prime is 664136329. The reversal of 664136325 is 523631466.

664136325 is a `hidden beast` number, since 6 + 6 + 4 + 13 + 632 + 5 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 44275716 + 619860609 = 6654^2 + 24897^2 .

It is not a de Polignac number, because 664136325 - 2¹² = 664132229 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 664136325.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664136329) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1475634 + ... + 1476083.

Almost surely, 2^664136325 is an apocalyptic number.

It is an amenable number.

664136325 is a deficient number, since it is larger than the sum of its proper divisors (525406029).

664136325 is a wasteful number, since it uses less digits than its factorization.

664136325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2951733 (or 2951725 counting only the distinct ones).

The product of its digits is 77760, while the sum is 36.

The square root of 664136325 is about 25770.8425357030. The cubic root of 664136325 is about 872.4738349529.

The spelling of 664136325 in words is "six hundred sixty-four million, one hundred thirty-six thousand, three hundred twenty-five".