640779099315 has 32 divisors (see below), whose sum is σ = 1086353384256. Its totient is φ = 321409474560.

The previous prime is 640779099299. The next prime is 640779099413. The reversal of 640779099315 is 513990977046.

It is not a de Polignac number, because 640779099315 - 2⁴ = 640779099299 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 576112 + ... + 1270221.

It is an arithmetic number, because the mean of its divisors is an integer number (33948543258).

Almost surely, 2^640779099315 is an apocalyptic number.

640779099315 is a deficient number, since it is larger than the sum of its proper divisors (445574284941).

640779099315 is a wasteful number, since it uses less digits than its factorization.

640779099315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1847719.

The product of its (nonzero) digits is 12859560, while the sum is 60.

The spelling of 640779099315 in words is "six hundred forty billion, seven hundred seventy-nine million, ninety-nine thousand, three hundred fifteen".