645323700675 has 24 divisors (see below), whose sum is σ = 1082859599296. Its totient is φ = 339035732640.

The previous prime is 645323700649. The next prime is 645323700709. The reversal of 645323700675 is 576007323546.

It is not a de Polignac number, because 645323700675 - 2¹⁸ = 645323438531 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64206289 + ... + 64216338.

Almost surely, 2^645323700675 is an apocalyptic number.

645323700675 is a deficient number, since it is larger than the sum of its proper divisors (437535898621).

645323700675 is a wasteful number, since it uses less digits than its factorization.

645323700675 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128422707 (or 128422702 counting only the distinct ones).

The product of its (nonzero) digits is 3175200, while the sum is 48.

The spelling of 645323700675 in words is "six hundred forty-five billion, three hundred twenty-three million, seven hundred thousand, six hundred seventy-five".