6640625125 has 8 divisors (see below), whose sum is σ = 8287500312. Its totient is φ = 5312500000.

The previous prime is 6640625107. The next prime is 6640625137. The reversal of 6640625125 is 5215260466.

It can be written as a sum of positive squares in 4 ways, for example, as 879359716 + 5761265409 = 29654^2 + 75903^2 .

It is not a de Polignac number, because 6640625125 - 2²³ = 6632236517 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 26562376 + ... + 26562625.

It is an arithmetic number, because the mean of its divisors is an integer number (1035937539).

Almost surely, 2^6640625125 is an apocalyptic number.

It is an amenable number.

6640625125 is a deficient number, since it is larger than the sum of its proper divisors (1646875187).

6640625125 is an equidigital number, since it uses as much as digits as its factorization.

6640625125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53125016 (or 53125006 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 37.

The square root of 6640625125 is about 81490.0308319981. The cubic root of 6640625125 is about 1879.6182570499.

The spelling of 6640625125 in words is "six billion, six hundred forty million, six hundred twenty-five thousand, one hundred twenty-five".