31640660253 has 12 divisors (see below), whose sum is σ = 48391598268. Its totient is φ = 19852963200.

The previous prime is 31640660251. The next prime is 31640660267. The reversal of 31640660253 is 35206604613.

31640660253 is a `hidden beast` number, since 3 + 1 + 6 + 40 + 6 + 602 + 5 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 18252550404 + 13388109849 = 135102^2 + 115707^2 .

It is not a de Polignac number, because 31640660253 - 2¹ = 31640660251 is a prime.

It is a super-2 number, since 2×31640660253² (a number of 22 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31640660251) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 103400698 + ... + 103401003.

It is an arithmetic number, because the mean of its divisors is an integer number (4032633189).

Almost surely, 2^31640660253 is an apocalyptic number.

It is an amenable number.

31640660253 is a deficient number, since it is larger than the sum of its proper divisors (16750938015).

31640660253 is a wasteful number, since it uses less digits than its factorization.

31640660253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206801724 (or 206801721 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

The spelling of 31640660253 in words is "thirty-one billion, six hundred forty million, six hundred sixty thousand, two hundred fifty-three".