640260503918 has 16 divisors (see below), whose sum is σ = 1097766643200. Its totient is φ = 274353056856.

The previous prime is 640260503863. The next prime is 640260503963. The reversal of 640260503918 is 819305062046.

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, 3601946 + ... + 3775517.

It is an arithmetic number, because the mean of its divisors is an integer number (68610415200).

Almost surely, 2^640260503918 is an apocalyptic number.

640260503918 is a deficient number, since it is larger than the sum of its proper divisors (457506139282).

640260503918 is a wasteful number, since it uses less digits than its factorization.

640260503918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7383671.

The product of its (nonzero) digits is 311040, while the sum is 44.

The spelling of 640260503918 in words is "six hundred forty billion, two hundred sixty million, five hundred three thousand, nine hundred eighteen".