31661660143 has 2 divisors, whose sum is σ = 31661660144. Its totient is φ = 31661660142.

The previous prime is 31661660117. The next prime is 31661660153. The reversal of 31661660143 is 34106616613.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31661660143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31661660153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15830830071 + 15830830072.

It is an arithmetic number, because the mean of its divisors is an integer number (15830830072).

Almost surely, 2^31661660143 is an apocalyptic number.

31661660143 is a deficient number, since it is larger than the sum of its proper divisors (1).

31661660143 is an equidigital number, since it uses as much as digits as its factorization.

31661660143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 37.

The spelling of 31661660143 in words is "thirty-one billion, six hundred sixty-one million, six hundred sixty thousand, one hundred forty-three".