31669864913 has 4 divisors (see below), whose sum is σ = 32267409588. Its totient is φ = 31072320240.

The previous prime is 31669864909. The next prime is 31669864997. The reversal of 31669864913 is 31946896613.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31946896613 = 2207 ⋅14475259.

It can be written as a sum of positive squares in 2 ways, for example, as 24216650689 + 7453214224 = 155617^2 + 86332^2 .

It is a cyclic number.

It is not a de Polignac number, because 31669864913 - 2² = 31669864909 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31669864013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 298772258 + ... + 298772363.

It is an arithmetic number, because the mean of its divisors is an integer number (8066852397).

Almost surely, 2^31669864913 is an apocalyptic number.

It is an amenable number.

31669864913 is a deficient number, since it is larger than the sum of its proper divisors (597544675).

31669864913 is an equidigital number, since it uses as much as digits as its factorization.

31669864913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 597544674.

The product of its digits is 5038848, while the sum is 56.

The spelling of 31669864913 in words is "thirty-one billion, six hundred sixty-nine million, eight hundred sixty-four thousand, nine hundred thirteen".