640843846254 has 48 divisors (see below), whose sum is σ = 1417523693040. Its totient is φ = 209176842240.

The previous prime is 640843846243. The next prime is 640843846289. The reversal of 640843846254 is 452648348046.

It is a happy number.

640843846254 is a `hidden beast` number, since 6 + 4 + 0 + 8 + 4 + 3 + 8 + 4 + 625 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 640843846254.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 901057 + ... + 1446924.

It is an arithmetic number, because the mean of its divisors is an integer number (29531743605).

Almost surely, 2^640843846254 is an apocalyptic number.

640843846254 is an abundant number, since it is smaller than the sum of its proper divisors (776679846786).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640843846254 is a wasteful number, since it uses less digits than its factorization.

640843846254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2348305 (or 2348302 counting only the distinct ones).

The product of its (nonzero) digits is 17694720, while the sum is 54.

The spelling of 640843846254 in words is "six hundred forty billion, eight hundred forty-three million, eight hundred forty-six thousand, two hundred fifty-four".