640504313166 has 16 divisors (see below), whose sum is σ = 1281028137984. Its totient is φ = 213498185784.

The previous prime is 640504313159. The next prime is 640504313201. The reversal of 640504313166 is 661313405046.

It is a congruent number.

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, 367456 + ... + 1189971.

It is an arithmetic number, because the mean of its divisors is an integer number (80064258624).

Almost surely, 2^640504313166 is an apocalyptic number.

640504313166 is an abundant number, since it is smaller than the sum of its proper divisors (640523824818).

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

640504313166 is a wasteful number, since it uses less digits than its factorization.

640504313166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1625975.

The product of its (nonzero) digits is 155520, while the sum is 39.

The spelling of 640504313166 in words is "six hundred forty billion, five hundred four million, three hundred thirteen thousand, one hundred sixty-six".