640322502516 has 72 divisors (see below), whose sum is σ = 1642958710848. Its totient is φ = 210233520000.

The previous prime is 640322502511. The next prime is 640322502541. The reversal of 640322502516 is 615205223046.

640322502516 is a `hidden beast` number, since 6 + 403 + 225 + 0 + 25 + 1 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640322502511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2567176 + ... + 2805536.

It is an arithmetic number, because the mean of its divisors is an integer number (22818870984).

Almost surely, 2^640322502516 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640322502516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (821479355424).

640322502516 is an abundant number, since it is smaller than the sum of its proper divisors (1002636208332).

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

640322502516 is a wasteful number, since it uses less digits than its factorization.

640322502516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239493 (or 239488 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The spelling of 640322502516 in words is "six hundred forty billion, three hundred twenty-two million, five hundred two thousand, five hundred sixteen".