645139025 has 12 divisors (see below), whose sum is σ = 803167344. Its totient is φ = 514050000.

The previous prime is 645139007. The next prime is 645139031. The reversal of 645139025 is 520931546.

It is not a de Polignac number, because 645139025 - 2⁶ = 645138961 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45131 + ... + 57680.

It is an arithmetic number, because the mean of its divisors is an integer number (66930612).

Almost surely, 2^645139025 is an apocalyptic number.

It is an amenable number.

645139025 is a deficient number, since it is larger than the sum of its proper divisors (158028319).

645139025 is a wasteful number, since it uses less digits than its factorization.

645139025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103072 (or 103067 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 645139025 is about 25399.5871029432. The cubic root of 645139025 is about 864.0743324715.

The spelling of 645139025 in words is "six hundred forty-five million, one hundred thirty-nine thousand, twenty-five".