645810654732 has 48 divisors (see below), whose sum is σ = 1529528058240. Its totient is φ = 212037040512.

The previous prime is 645810654677. The next prime is 645810654751. The reversal of 645810654732 is 237456018546.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10073523 + ... + 10137429.

It is an arithmetic number, because the mean of its divisors is an integer number (31865167880).

Almost surely, 2^645810654732 is an apocalyptic number.

It is an amenable number.

645810654732 is an abundant number, since it is smaller than the sum of its proper divisors (883717403508).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645810654732 is a wasteful number, since it uses less digits than its factorization.

645810654732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76550 (or 76548 counting only the distinct ones).

The product of its (nonzero) digits is 4838400, while the sum is 51.

The spelling of 645810654732 in words is "six hundred forty-five billion, eight hundred ten million, six hundred fifty-four thousand, seven hundred thirty-two".