645231773024 has 48 divisors (see below), whose sum is σ = 1276743093696. Its totient is φ = 320983555200.

The previous prime is 645231773023. The next prime is 645231773029. The reversal of 645231773024 is 420377132546.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645231773023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5138639 + ... + 5262705.

It is an arithmetic number, because the mean of its divisors is an integer number (26598814452).

Almost surely, 2^645231773024 is an apocalyptic number.

It is an amenable number.

645231773024 is a deficient number, since it is larger than the sum of its proper divisors (631511320672).

645231773024 is a wasteful number, since it uses less digits than its factorization.

645231773024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124899 (or 124891 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 44.

The spelling of 645231773024 in words is "six hundred forty-five billion, two hundred thirty-one million, seven hundred seventy-three thousand, twenty-four".