640144264502 has 16 divisors (see below), whose sum is σ = 961105496112. Its totient is φ = 319775850240.

The previous prime is 640144264499. The next prime is 640144264511. The reversal of 640144264502 is 205462441046.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18971198 + ... + 19004910.

It is an arithmetic number, because the mean of its divisors is an integer number (60069093507).

Almost surely, 2^640144264502 is an apocalyptic number.

640144264502 is a deficient number, since it is larger than the sum of its proper divisors (320961231610).

640144264502 is a wasteful number, since it uses less digits than its factorization.

640144264502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42223.

The product of its (nonzero) digits is 184320, while the sum is 38.

The spelling of 640144264502 in words is "six hundred forty billion, one hundred forty-four million, two hundred sixty-four thousand, five hundred two".