640856177283 has 16 divisors (see below), whose sum is σ = 976554593280. Its totient is φ = 366199087296.

The previous prime is 640856177263. The next prime is 640856177287. The reversal of 640856177283 is 382771658046.

It is not a de Polignac number, because 640856177283 - 2²⁴ = 640839400067 is a prime.

It is not an unprimeable number, because it can be changed into a prime (640856177287) 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, 2478463 + ... + 2724791.

It is an arithmetic number, because the mean of its divisors is an integer number (61034662080).

Almost surely, 2^640856177283 is an apocalyptic number.

640856177283 is a deficient number, since it is larger than the sum of its proper divisors (335698415997).

640856177283 is a wasteful number, since it uses less digits than its factorization.

640856177283 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370226.

The product of its (nonzero) digits is 13547520, while the sum is 57.

The spelling of 640856177283 in words is "six hundred forty billion, eight hundred fifty-six million, one hundred seventy-seven thousand, two hundred eighty-three".