640254353546 has 16 divisors (see below), whose sum is σ = 965845296000. Its totient is φ = 318309745248.

The previous prime is 640254353539. The next prime is 640254353567. The reversal of 640254353546 is 645353452046.

It is a self number, because there is not a number n which added to its sum of digits gives 640254353546.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 620396 + ... + 1290503.

It is an arithmetic number, because the mean of its divisors is an integer number (60365331000).

Almost surely, 2^640254353546 is an apocalyptic number.

640254353546 is a deficient number, since it is larger than the sum of its proper divisors (325590942454).

640254353546 is a wasteful number, since it uses less digits than its factorization.

640254353546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1911853.

The product of its (nonzero) digits is 5184000, while the sum is 47.

The spelling of 640254353546 in words is "six hundred forty billion, two hundred fifty-four million, three hundred fifty-three thousand, five hundred forty-six".