640997410340 has 96 divisors (see below), whose sum is σ = 1651830050304. Its totient is φ = 203929528320.

The previous prime is 640997410307. The next prime is 640997410363. The reversal of 640997410340 is 43014799046.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1727687 + ... + 2065646.

It is an arithmetic number, because the mean of its divisors is an integer number (17206563024).

Almost surely, 2^640997410340 is an apocalyptic number.

It is an amenable number.

640997410340 is an abundant number, since it is smaller than the sum of its proper divisors (1010832639964).

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

640997410340 is a wasteful number, since it uses less digits than its factorization.

640997410340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3793437 (or 3793435 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 47.

The spelling of 640997410340 in words is "six hundred forty billion, nine hundred ninety-seven million, four hundred ten thousand, three hundred forty".