6640125025 has 12 divisors (see below), whose sum is σ = 8235322732. Its totient is φ = 5311088640.

The previous prime is 6640125017. The next prime is 6640125053. The reversal of 6640125025 is 5205210466.

6640125025 is digitally balanced in base 3, 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 6 ways, for example, as 2909847249 + 3730277776 = 53943^2 + 61076^2 .

It is not a de Polignac number, because 6640125025 - 2³ = 6640125017 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 126517 + ... + 171133.

Almost surely, 2^6640125025 is an apocalyptic number.

It is an amenable number.

6640125025 is a deficient number, since it is larger than the sum of its proper divisors (1595197707).

6640125025 is a wasteful number, since it uses less digits than its factorization.

6640125025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50580 (or 50575 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 6640125025 is about 81486.9623007264. The cubic root of 6640125025 is about 1879.5710716986.

The spelling of 6640125025 in words is "six billion, six hundred forty million, one hundred twenty-five thousand, twenty-five".