13158743561 has 2 divisors, whose sum is σ = 13158743562. Its totient is φ = 13158743560.

The previous prime is 13158743471. The next prime is 13158743617. The reversal of 13158743561 is 16534785131.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12711209536 + 447534025 = 112744^2 + 21155^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13158743561 is a prime.

It is not a weakly prime, because it can be changed into another prime (13158743761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6579371780 + 6579371781.

It is an arithmetic number, because the mean of its divisors is an integer number (6579371781).

Almost surely, 2^13158743561 is an apocalyptic number.

It is an amenable number.

13158743561 is a deficient number, since it is larger than the sum of its proper divisors (1).

13158743561 is an equidigital number, since it uses as much as digits as its factorization.

13158743561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 302400, while the sum is 44.

The spelling of 13158743561 in words is "thirteen billion, one hundred fifty-eight million, seven hundred forty-three thousand, five hundred sixty-one".