13561415163991 has 2 divisors, whose sum is σ = 13561415163992. Its totient is φ = 13561415163990.

The previous prime is 13561415163953. The next prime is 13561415164001. The reversal of 13561415163991 is 19936151416531.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13561415163991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13561410163991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6780707581995 + 6780707581996.

It is an arithmetic number, because the mean of its divisors is an integer number (6780707581996).

Almost surely, 2^{13561415163991} is an apocalyptic number.

13561415163991 is a deficient number, since it is larger than the sum of its proper divisors (1).

13561415163991 is an equidigital number, since it uses as much as digits as its factorization.

13561415163991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2624400, while the sum is 55.

The spelling of 13561415163991 in words is "thirteen trillion, five hundred sixty-one billion, four hundred fifteen million, one hundred sixty-three thousand, nine hundred ninety-one".