13565111245991 has 2 divisors, whose sum is σ = 13565111245992. Its totient is φ = 13565111245990.

The previous prime is 13565111245943. The next prime is 13565111245993. The reversal of 13565111245991 is 19954211156531.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13565111245991 is a prime.

It is a super-2 number, since 2×13565111245991² (a number of 27 digits) contains 22 as substring.

Together with 13565111245993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13565111245993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6782555622995 + 6782555622996.

It is an arithmetic number, because the mean of its divisors is an integer number (6782555622996).

Almost surely, 2^{13565111245991} is an apocalyptic number.

13565111245991 is a deficient number, since it is larger than the sum of its proper divisors (1).

13565111245991 is an equidigital number, since it uses as much as digits as its factorization.

13565111245991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1458000, while the sum is 53.

The spelling of 13565111245991 in words is "thirteen trillion, five hundred sixty-five billion, one hundred eleven million, two hundred forty-five thousand, nine hundred ninety-one".