31660631655559 has 2 divisors, whose sum is σ = 31660631655560. Its totient is φ = 31660631655558.

The previous prime is 31660631655529. The next prime is 31660631655581. The reversal of 31660631655559 is 95555613606613.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31660631655559 - 2⁷ = 31660631655431 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31660631655497 and 31660631655506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31660631655529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15830315827779 + 15830315827780.

It is an arithmetic number, because the mean of its divisors is an integer number (15830315827780).

Almost surely, 2^{31660631655559} is an apocalyptic number.

31660631655559 is a deficient number, since it is larger than the sum of its proper divisors (1).

31660631655559 is an equidigital number, since it uses as much as digits as its factorization.

31660631655559 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 65610000, while the sum is 61.

The spelling of 31660631655559 in words is "thirty-one trillion, six hundred sixty billion, six hundred thirty-one million, six hundred fifty-five thousand, five hundred fifty-nine".