640201338634 has 96 divisors (see below), whose sum is σ = 1168695814608. Its totient is φ = 261078681600.

The previous prime is 640201338613. The next prime is 640201338701. The reversal of 640201338634 is 436833102046.

640201338634 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 360522189225 + 279679149409 = 600435^2 + 528847^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 137468434 + ... + 137473090.

Almost surely, 2^640201338634 is an apocalyptic number.

640201338634 is a deficient number, since it is larger than the sum of its proper divisors (528494475974).

640201338634 is a wasteful number, since it uses less digits than its factorization.

640201338634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5912 (or 5901 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 40.

The spelling of 640201338634 in words is "six hundred forty billion, two hundred one million, three hundred thirty-eight thousand, six hundred thirty-four".