645332670625 has 40 divisors (see below), whose sum is σ = 835551288000. Its totient is φ = 497938584000.

The previous prime is 645332670617. The next prime is 645332670629. The reversal of 645332670625 is 526076233546.

It is not a de Polignac number, because 645332670625 - 2³ = 645332670617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645332670629) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1789276 + ... + 2119474.

It is an arithmetic number, because the mean of its divisors is an integer number (20888782200).

Almost surely, 2^645332670625 is an apocalyptic number.

It is an amenable number.

645332670625 is a deficient number, since it is larger than the sum of its proper divisors (190218617375).

645332670625 is an equidigital number, since it uses as much as digits as its factorization.

645332670625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330331 (or 330316 counting only the distinct ones).

The product of its (nonzero) digits is 5443200, while the sum is 49.

The spelling of 645332670625 in words is "six hundred forty-five billion, three hundred thirty-two million, six hundred seventy thousand, six hundred twenty-five".