31566232623613 has 2 divisors, whose sum is σ = 31566232623614. Its totient is φ = 31566232623612.

The previous prime is 31566232623587. The next prime is 31566232623631. The reversal of 31566232623613 is 31632623266513.

It is a happy number.

Together with next prime (31566232623631) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25090902482724 + 6475330140889 = 5009082^2 + 2544667^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31566232623613 is a prime.

It is a super-2 number, since 2×31566232623613² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31566232623413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15783116311806 + 15783116311807.

It is an arithmetic number, because the mean of its divisors is an integer number (15783116311807).

Almost surely, 2^{31566232623613} is an apocalyptic number.

It is an amenable number.

31566232623613 is a deficient number, since it is larger than the sum of its proper divisors (1).

31566232623613 is an equidigital number, since it uses as much as digits as its factorization.

31566232623613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4199040, while the sum is 49.

The spelling of 31566232623613 in words is "thirty-one trillion, five hundred sixty-six billion, two hundred thirty-two million, six hundred twenty-three thousand, six hundred thirteen".