31660423499 has 2 divisors, whose sum is σ = 31660423500. Its totient is φ = 31660423498.

The previous prime is 31660423481. The next prime is 31660423511. The reversal of 31660423499 is 99432406613.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31660423499 is a prime.

It is a super-2 number, since 2×31660423499² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31660423469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15830211749 + 15830211750.

It is an arithmetic number, because the mean of its divisors is an integer number (15830211750).

Almost surely, 2^31660423499 is an apocalyptic number.

31660423499 is a deficient number, since it is larger than the sum of its proper divisors (1).

31660423499 is an equidigital number, since it uses as much as digits as its factorization.

31660423499 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 839808, while the sum is 47.

The spelling of 31660423499 in words is "thirty-one billion, six hundred sixty million, four hundred twenty-three thousand, four hundred ninety-nine".