664063625 has 8 divisors (see below), whose sum is σ = 828751560. Its totient is φ = 531250800.

The previous prime is 664063607. The next prime is 664063657. The reversal of 664063625 is 526360466.

664063625 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1567504 + 662496121 = 1252^2 + 25739^2 .

It is a de Polignac number, because none of the positive numbers 2^k-664063625 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2656130 + ... + 2656379.

It is an arithmetic number, because the mean of its divisors is an integer number (103593945).

Almost surely, 2^664063625 is an apocalyptic number.

It is an amenable number.

664063625 is a deficient number, since it is larger than the sum of its proper divisors (164687935).

664063625 is an equidigital number, since it uses as much as digits as its factorization.

664063625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5312524 (or 5312514 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 38.

The square root of 664063625 is about 25769.4319883074. The cubic root of 664063625 is about 872.4419985362.

The spelling of 664063625 in words is "six hundred sixty-four million, sixty-three thousand, six hundred twenty-five".