640322651169 has 16 divisors (see below), whose sum is σ = 964704561600. Its totient is φ = 419646482208.

The previous prime is 640322651161. The next prime is 640322651251. The reversal of 640322651169 is 961156223046.

640322651169 is a `hidden beast` number, since 6 + 40 + 32 + 2 + 6 + 511 + 69 = 666.

It is not a de Polignac number, because 640322651169 - 2³ = 640322651161 is a prime.

It is a super-2 number, since 2×640322651169² (a number of 24 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (640322651161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 200978524 + ... + 200981709.

It is an arithmetic number, because the mean of its divisors is an integer number (60294035100).

Almost surely, 2^640322651169 is an apocalyptic number.

It is an amenable number.

640322651169 is a deficient number, since it is larger than the sum of its proper divisors (324381910431).

640322651169 is a wasteful number, since it uses less digits than its factorization.

640322651169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401960301 (or 401960295 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The spelling of 640322651169 in words is "six hundred forty billion, three hundred twenty-two million, six hundred fifty-one thousand, one hundred sixty-nine".