640722325275 has 36 divisors (see below), whose sum is σ = 1150633010280. Its totient is φ = 340816896000.

The previous prime is 640722325273. The next prime is 640722325289. The reversal of 640722325275 is 572523227046.

640722325275 is a `hidden beast` number, since 6 + 407 + 2 + 232 + 5 + 2 + 7 + 5 = 666.

640722325275 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 640722325275 - 2¹ = 640722325273 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 640722325275.

It is not an unprimeable number, because it can be changed into a prime (640722325273) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3671526 + ... + 3842075.

Almost surely, 2^640722325275 is an apocalyptic number.

640722325275 is a deficient number, since it is larger than the sum of its proper divisors (509910685005).

640722325275 is a wasteful number, since it uses less digits than its factorization.

640722325275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7513996 (or 7513988 counting only the distinct ones).

The product of its (nonzero) digits is 1411200, while the sum is 45.

The spelling of 640722325275 in words is "six hundred forty billion, seven hundred twenty-two million, three hundred twenty-five thousand, two hundred seventy-five".