15111166080721 has 2 divisors, whose sum is σ = 15111166080722. Its totient is φ = 15111166080720.

The previous prime is 15111166080713. The next prime is 15111166080727. The reversal of 15111166080721 is 12708066111151.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9064681799121 + 6046484281600 = 3010761^2 + 2458960^2 .

It is an emirp because it is prime and its reverse (12708066111151) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15111166080721 - 2³ = 15111166080713 is a prime.

It is not a weakly prime, because it can be changed into another prime (15111166080727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7555583040360 + 7555583040361.

It is an arithmetic number, because the mean of its divisors is an integer number (7555583040361).

Almost surely, 2^{15111166080721} is an apocalyptic number.

It is an amenable number.

15111166080721 is a deficient number, since it is larger than the sum of its proper divisors (1).

15111166080721 is an equidigital number, since it uses as much as digits as its factorization.

15111166080721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 40.

The spelling of 15111166080721 in words is "fifteen trillion, one hundred eleven billion, one hundred sixty-six million, eighty thousand, seven hundred twenty-one".