640518156411 has 32 divisors (see below), whose sum is σ = 987394813440. Its totient is φ = 361757684736.

The previous prime is 640518156307. The next prime is 640518156413. The reversal of 640518156411 is 114651815046.

It is not a de Polignac number, because 640518156411 - 2⁹ = 640518155899 is a prime.

It is not an unprimeable number, because it can be changed into a prime (640518156413) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1334320 + ... + 1749698.

It is an arithmetic number, because the mean of its divisors is an integer number (30856087920).

Almost surely, 2^640518156411 is an apocalyptic number.

640518156411 is a deficient number, since it is larger than the sum of its proper divisors (346876657029).

640518156411 is a wasteful number, since it uses less digits than its factorization.

640518156411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416243.

The product of its (nonzero) digits is 115200, while the sum is 42.

The spelling of 640518156411 in words is "six hundred forty billion, five hundred eighteen million, one hundred fifty-six thousand, four hundred eleven".