640251535354 has 16 divisors (see below), whose sum is σ = 991378402560. Its totient is φ = 309792509280.

The previous prime is 640251535333. The next prime is 640251535367. The reversal of 640251535354 is 453535152046.

It is a self number, because there is not a number n which added to its sum of digits gives 640251535354.

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, 4098342 + ... + 4251694.

It is an arithmetic number, because the mean of its divisors is an integer number (61961150160).

Almost surely, 2^640251535354 is an apocalyptic number.

640251535354 is a deficient number, since it is larger than the sum of its proper divisors (351126867206).

640251535354 is a wasteful number, since it uses less digits than its factorization.

640251535354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220725.

The product of its (nonzero) digits is 1080000, while the sum is 43.

The spelling of 640251535354 in words is "six hundred forty billion, two hundred fifty-one million, five hundred thirty-five thousand, three hundred fifty-four".