645312232356 has 48 divisors (see below), whose sum is σ = 1643137634880. Its totient is φ = 195486699520.

The previous prime is 645312232349. The next prime is 645312232361. The reversal of 645312232356 is 653232213546.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 365121 + ... + 1193288.

It is an arithmetic number, because the mean of its divisors is an integer number (34232034060).

Almost surely, 2^645312232356 is an apocalyptic number.

645312232356 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

645312232356 is an abundant number, since it is smaller than the sum of its proper divisors (997825402524).

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

645312232356 is a wasteful number, since it uses less digits than its factorization.

645312232356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1561564 (or 1561562 counting only the distinct ones).

The product of its digits is 777600, while the sum is 42.

The spelling of 645312232356 in words is "six hundred forty-five billion, three hundred twelve million, two hundred thirty-two thousand, three hundred fifty-six".