640437753815 has 16 divisors (see below), whose sum is σ = 780091471200. Its totient is φ = 504641301120.

The previous prime is 640437753719. The next prime is 640437753827. The reversal of 640437753815 is 518357734046.

640437753815 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 640437753815 - 2⁸ = 640437753559 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2721461 + ... + 2947409.

It is an arithmetic number, because the mean of its divisors is an integer number (48755716950).

Almost surely, 2^640437753815 is an apocalyptic number.

640437753815 is a deficient number, since it is larger than the sum of its proper divisors (139653717385).

640437753815 is a wasteful number, since it uses less digits than its factorization.

640437753815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234482.

The product of its (nonzero) digits is 8467200, while the sum is 53.

The spelling of 640437753815 in words is "six hundred forty billion, four hundred thirty-seven million, seven hundred fifty-three thousand, eight hundred fifteen".