640348188135 has 16 divisors (see below), whose sum is σ = 1024567643520. Its totient is φ = 341515519520.

The previous prime is 640348188127. The next prime is 640348188157. The reversal of 640348188135 is 531881843046.

It is not a de Polignac number, because 640348188135 - 2³ = 640348188127 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 2030020 + ... + 2324150.

It is an arithmetic number, because the mean of its divisors is an integer number (64035477720).

Almost surely, 2^640348188135 is an apocalyptic number.

640348188135 is a deficient number, since it is larger than the sum of its proper divisors (384219455385).

640348188135 is a wasteful number, since it uses less digits than its factorization.

640348188135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439278.

The product of its (nonzero) digits is 2211840, while the sum is 51.

The spelling of 640348188135 in words is "six hundred forty billion, three hundred forty-eight million, one hundred eighty-eight thousand, one hundred thirty-five".