15561150161 has 2 divisors, whose sum is σ = 15561150162. Its totient is φ = 15561150160.

The previous prime is 15561150151. The next prime is 15561150169. The reversal of 15561150161 is 16105116551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14180284561 + 1380865600 = 119081^2 + 37160^2 .

It is a cyclic number.

It is not a de Polignac number, because 15561150161 - 2⁶ = 15561150097 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (15561150169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7780575080 + 7780575081.

It is an arithmetic number, because the mean of its divisors is an integer number (7780575081).

Almost surely, 2^15561150161 is an apocalyptic number.

It is an amenable number.

15561150161 is a deficient number, since it is larger than the sum of its proper divisors (1).

15561150161 is an equidigital number, since it uses as much as digits as its factorization.

15561150161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4500, while the sum is 32.

The spelling of 15561150161 in words is "fifteen billion, five hundred sixty-one million, one hundred fifty thousand, one hundred sixty-one".