640666253300 has 36 divisors (see below), whose sum is σ = 1393747734540. Its totient is φ = 255620977920.

The previous prime is 640666253273. The next prime is 640666253327. The reversal of 640666253300 is 3352666046.

It is an interprime number because it is at equal distance from previous prime (640666253273) and next prime (640666253327).

It can be written as a sum of positive squares in 6 ways, for example, as 4873715344 + 635792537956 = 69812^2 + 797366^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8029145 + ... + 8108544.

Almost surely, 2^640666253300 is an apocalyptic number.

It is an amenable number.

640666253300 is an abundant number, since it is smaller than the sum of its proper divisors (753081481240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640666253300 is a wasteful number, since it uses less digits than its factorization.

640666253300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16138100 (or 16138093 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 41.

The spelling of 640666253300 in words is "six hundred forty billion, six hundred sixty-six million, two hundred fifty-three thousand, three hundred".