645635244464 has 40 divisors (see below), whose sum is σ = 1513716249888. Its totient is φ = 260424299520.

The previous prime is 645635244433. The next prime is 645635244467. The reversal of 645635244464 is 464442536546.

It is not an unprimeable number, because it can be changed into a prime (645635244467) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 169545167 + ... + 169548974.

Almost surely, 2^645635244464 is an apocalyptic number.

It is an amenable number.

645635244464 is an abundant number, since it is smaller than the sum of its proper divisors (868081005424).

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

645635244464 is a wasteful number, since it uses less digits than its factorization.

645635244464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339094173 (or 339094167 counting only the distinct ones).

The product of its digits is 33177600, while the sum is 53.

The spelling of 645635244464 in words is "six hundred forty-five billion, six hundred thirty-five million, two hundred forty-four thousand, four hundred sixty-four".