31275635661 has 12 divisors (see below), whose sum is σ = 45177719392. Its totient is φ = 20849592456.

The previous prime is 31275635581. The next prime is 31275635669. The reversal of 31275635661 is 16653657213.

31275635661 is a `hidden beast` number, since 3 + 1 + 2 + 7 + 5 + 635 + 6 + 6 + 1 = 666.

It is not a de Polignac number, because 31275635661 - 2¹⁵ = 31275602893 is a prime.

It is a super-2 number, since 2×31275635661² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31275635669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 243150 + ... + 348816.

Almost surely, 2^31275635661 is an apocalyptic number.

It is an amenable number.

31275635661 is a deficient number, since it is larger than the sum of its proper divisors (13902083731).

31275635661 is a wasteful number, since it uses less digits than its factorization.

31275635661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138560 (or 138557 counting only the distinct ones).

The product of its digits is 680400, while the sum is 45.

The spelling of 31275635661 in words is "thirty-one billion, two hundred seventy-five million, six hundred thirty-five thousand, six hundred sixty-one".