6640527625 has 16 divisors (see below), whose sum is σ = 8480115072. Its totient is φ = 5188873200.

The previous prime is 6640527617. The next prime is 6640527659. The reversal of 6640527625 is 5267250466.

It is not a de Polignac number, because 6640527625 - 2³ = 6640527617 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 612349 + ... + 623098.

It is an arithmetic number, because the mean of its divisors is an integer number (530007192).

Almost surely, 2^6640527625 is an apocalyptic number.

It is an amenable number.

6640527625 is a deficient number, since it is larger than the sum of its proper divisors (1839587447).

6640527625 is a wasteful number, since it uses less digits than its factorization.

6640527625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1235505 (or 1235495 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 43.

The square root of 6640527625 is about 81489.4325971165. The cubic root of 6640527625 is about 1879.6090579322.

The spelling of 6640527625 in words is "six billion, six hundred forty million, five hundred twenty-seven thousand, six hundred twenty-five".