640914665275 has 12 divisors (see below), whose sum is σ = 794845418800. Its totient is φ = 512659968480.

The previous prime is 640914665269. The next prime is 640914665317. The reversal of 640914665275 is 572566419046.

It is not a de Polignac number, because 640914665275 - 2³¹ = 638767181627 is a prime.

It is a hoax number, since the sum of its digits (55) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1611540 + ... + 1969489.

Almost surely, 2^640914665275 is an apocalyptic number.

640914665275 is a deficient number, since it is larger than the sum of its proper divisors (153930753525).

640914665275 is a wasteful number, since it uses less digits than its factorization.

640914665275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3588198 (or 3588193 counting only the distinct ones).

The product of its (nonzero) digits is 10886400, while the sum is 55.

The spelling of 640914665275 in words is "six hundred forty billion, nine hundred fourteen million, six hundred sixty-five thousand, two hundred seventy-five".