640351112615 has 32 divisors (see below), whose sum is σ = 778626072576. Its totient is φ = 505527281280.

The previous prime is 640351112581. The next prime is 640351112617. The reversal of 640351112615 is 516211153046.

It is not a de Polignac number, because 640351112615 - 2²⁸ = 640082677159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640351112617) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 122412050 + ... + 122417280.

It is an arithmetic number, because the mean of its divisors is an integer number (24332064768).

Almost surely, 2^640351112615 is an apocalyptic number.

640351112615 is a deficient number, since it is larger than the sum of its proper divisors (138274959961).

640351112615 is a wasteful number, since it uses less digits than its factorization.

640351112615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6359.

The product of its (nonzero) digits is 21600, while the sum is 35.

The spelling of 640351112615 in words is "six hundred forty billion, three hundred fifty-one million, one hundred twelve thousand, six hundred fifteen".