644510486754 has 48 divisors (see below), whose sum is σ = 1472757979680. Its totient is φ = 203138919360.

The previous prime is 644510486717. The next prime is 644510486783. The reversal of 644510486754 is 457684015446.

644510486754 is a `hidden beast` number, since 6 + 44 + 51 + 0 + 486 + 75 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 644510486754.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1630392 + ... + 1986755.

It is an arithmetic number, because the mean of its divisors is an integer number (30682457910).

Almost surely, 2^644510486754 is an apocalyptic number.

644510486754 is an abundant number, since it is smaller than the sum of its proper divisors (828247492926).

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

644510486754 is a wasteful number, since it uses less digits than its factorization.

644510486754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3617695 (or 3617692 counting only the distinct ones).

The product of its (nonzero) digits is 12902400, while the sum is 54.

The spelling of 644510486754 in words is "six hundred forty-four billion, five hundred ten million, four hundred eighty-six thousand, seven hundred fifty-four".