640450502024 has 8 divisors (see below), whose sum is σ = 1200844691310. Its totient is φ = 320225251008.

The previous prime is 640450501987. The next prime is 640450502129. The reversal of 640450502024 is 420205054046.

It can be written as a sum of positive squares in only one way, i.e., 609726722500 + 30723779524 = 780850^2 + 175282^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 40028156369 + ... + 40028156384.

Almost surely, 2^640450502024 is an apocalyptic number.

It is an amenable number.

640450502024 is a deficient number, since it is larger than the sum of its proper divisors (560394189286).

640450502024 is a wasteful number, since it uses less digits than its factorization.

640450502024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80056312759 (or 80056312755 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 32.

The spelling of 640450502024 in words is "six hundred forty billion, four hundred fifty million, five hundred two thousand, twenty-four".