640534094824 has 16 divisors (see below), whose sum is σ = 1293386153220. Its totient is φ = 295631120640.

The previous prime is 640534094819. The next prime is 640534094969. The reversal of 640534094824 is 428490435046.

It can be written as a sum of positive squares in 2 ways, for example, as 638193276900 + 2340817924 = 798870^2 + 48382^2 .

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 in 3 ways as a sum of consecutive naturals, for example, 3079490737 + ... + 3079490944.

Almost surely, 2^640534094824 is an apocalyptic number.

It is an amenable number.

640534094824 is an abundant number, since it is smaller than the sum of its proper divisors (652852058396).

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

640534094824 is a wasteful number, since it uses less digits than its factorization.

640534094824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6158981700 (or 6158981696 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 49.

The spelling of 640534094824 in words is "six hundred forty billion, five hundred thirty-four million, ninety-four thousand, eight hundred twenty-four".