640666253301 has 16 divisors (see below), whose sum is σ = 883698404160. Its totient is φ = 412373162880.

The previous prime is 640666253273. The next prime is 640666253327. The reversal of 640666253301 is 103352666046.

It is a happy number.

It is not a de Polignac number, because 640666253301 - 2¹⁹ = 640665729013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640666253371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6406041 + ... + 6505281.

It is an arithmetic number, because the mean of its divisors is an integer number (55231150260).

Almost surely, 2^640666253301 is an apocalyptic number.

It is an amenable number.

640666253301 is a deficient number, since it is larger than the sum of its proper divisors (243032150859).

640666253301 is a wasteful number, since it uses less digits than its factorization.

640666253301 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173476.

The product of its (nonzero) digits is 466560, while the sum is 42.

The spelling of 640666253301 in words is "six hundred forty billion, six hundred sixty-six million, two hundred fifty-three thousand, three hundred one".