15501120161 has 2 divisors, whose sum is σ = 15501120162. Its totient is φ = 15501120160.

The previous prime is 15501120109. The next prime is 15501120179. The reversal of 15501120161 is 16102110551.

15501120161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14621404561 + 879715600 = 120919^2 + 29660^2 .

It is a cyclic number.

It is not a de Polignac number, because 15501120161 - 2⁶ = 15501120097 is a prime.

It is not a weakly prime, because it can be changed into another prime (15501120101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7750560080 + 7750560081.

It is an arithmetic number, because the mean of its divisors is an integer number (7750560081).

Almost surely, 2^15501120161 is an apocalyptic number.

It is an amenable number.

15501120161 is a deficient number, since it is larger than the sum of its proper divisors (1).

15501120161 is an equidigital number, since it uses as much as digits as its factorization.

15501120161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 300, while the sum is 23.

The spelling of 15501120161 in words is "fifteen billion, five hundred one million, one hundred twenty thousand, one hundred sixty-one".