664248025 has 12 divisors (see below), whose sum is σ = 941334592. Its totient is φ = 455484240.

The previous prime is 664248023. The next prime is 664248031. The reversal of 664248025 is 520842466.

It is not a de Polignac number, because 664248025 - 2¹ = 664248023 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664248023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1897677 + ... + 1898026.

Almost surely, 2^664248025 is an apocalyptic number.

It is an amenable number.

664248025 is a deficient number, since it is larger than the sum of its proper divisors (277086567).

664248025 is a wasteful number, since it uses less digits than its factorization.

664248025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3795720 (or 3795715 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 37.

The square root of 664248025 is about 25773.0096224713. The cubic root of 664248025 is about 872.5227455257.

The spelling of 664248025 in words is "six hundred sixty-four million, two hundred forty-eight thousand, twenty-five".