18916506960971 has 2 divisors, whose sum is σ = 18916506960972. Its totient is φ = 18916506960970.

The previous prime is 18916506960887. The next prime is 18916506960991. The reversal of 18916506960971 is 17906960561981.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18916506960971 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (18916506960991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9458253480485 + 9458253480486.

It is an arithmetic number, because the mean of its divisors is an integer number (9458253480486).

Almost surely, 2^{18916506960971} is an apocalyptic number.

18916506960971 is a deficient number, since it is larger than the sum of its proper divisors (1).

18916506960971 is an equidigital number, since it uses as much as digits as its factorization.

18916506960971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 44089920, while the sum is 68.

The spelling of 18916506960971 in words is "eighteen trillion, nine hundred sixteen billion, five hundred six million, nine hundred sixty thousand, nine hundred seventy-one".