664235625 has 20 divisors (see below), whose sum is σ = 1106708240. Its totient is φ = 354258000.

The previous prime is 664235623. The next prime is 664235639. The reversal of 664235625 is 526532466.

It is not a de Polignac number, because 664235625 - 2¹ = 664235623 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (664235623) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 175255 + ... + 179004.

It is an arithmetic number, because the mean of its divisors is an integer number (55335412).

Almost surely, 2^664235625 is an apocalyptic number.

It is an amenable number.

664235625 is a deficient number, since it is larger than the sum of its proper divisors (442472615).

664235625 is an equidigital number, since it uses as much as digits as its factorization.

664235625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354282 (or 354267 counting only the distinct ones).

The product of its digits is 259200, while the sum is 39.

The square root of 664235625 is about 25772.7690596102. The cubic root of 664235625 is about 872.5173161535.

The spelling of 664235625 in words is "six hundred sixty-four million, two hundred thirty-five thousand, six hundred twenty-five".