640325310257 has 12 divisors (see below), whose sum is σ = 686941919196. Its totient is φ = 596692166400.

The previous prime is 640325310241. The next prime is 640325310269. The reversal of 640325310257 is 752013523046.

640325310257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 431906582416 + 208418727841 = 657196^2 + 456529^2 .

It is not a de Polignac number, because 640325310257 - 2⁴ = 640325310241 is a prime.

It is a super-3 number, since 3×640325310257³ (a number of 36 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 640325310257.

It is not an unprimeable number, because it can be changed into a prime (640325310227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10939418 + ... + 10997795.

It is an arithmetic number, because the mean of its divisors is an integer number (57245159933).

Almost surely, 2^640325310257 is an apocalyptic number.

It is an amenable number.

640325310257 is a deficient number, since it is larger than the sum of its proper divisors (46616608939).

640325310257 is a wasteful number, since it uses less digits than its factorization.

640325310257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21937348 (or 21937331 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 38.

The spelling of 640325310257 in words is "six hundred forty billion, three hundred twenty-five million, three hundred ten thousand, two hundred fifty-seven".