645877483944 has 64 divisors (see below), whose sum is σ = 2013124631040. Its totient is φ = 167760384960.

The previous prime is 645877483943. The next prime is 645877483961. The reversal of 645877483944 is 449384778546.

It is not an unprimeable number, because it can be changed into a prime (645877483943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 174748554 + ... + 174752249.

It is an arithmetic number, because the mean of its divisors is an integer number (31455072360).

Almost surely, 2^645877483944 is an apocalyptic number.

It is an amenable number.

645877483944 is an abundant number, since it is smaller than the sum of its proper divisors (1367247147096).

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

645877483944 is a wasteful number, since it uses less digits than its factorization.

645877483944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349500830 (or 349500826 counting only the distinct ones).

The product of its digits is 650280960, while the sum is 69.

The spelling of 645877483944 in words is "six hundred forty-five billion, eight hundred seventy-seven million, four hundred eighty-three thousand, nine hundred forty-four".