31668664109 has 2 divisors, whose sum is σ = 31668664110. Its totient is φ = 31668664108.

The previous prime is 31668664063. The next prime is 31668664151. The reversal of 31668664109 is 90146686613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30466655209 + 1202008900 = 174547^2 + 34670^2 .

It is a cyclic number.

It is not a de Polignac number, because 31668664109 - 2⁸ = 31668663853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31668664609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15834332054 + 15834332055.

It is an arithmetic number, because the mean of its divisors is an integer number (15834332055).

Almost surely, 2^31668664109 is an apocalyptic number.

It is an amenable number.

31668664109 is a deficient number, since it is larger than the sum of its proper divisors (1).

31668664109 is an equidigital number, since it uses as much as digits as its factorization.

31668664109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1119744, while the sum is 50.

The spelling of 31668664109 in words is "thirty-one billion, six hundred sixty-eight million, six hundred sixty-four thousand, one hundred nine".