15668161 has 2 divisors, whose sum is σ = 15668162. Its totient is φ = 15668160.

The previous prime is 15668153. The next prime is 15668171. The reversal of 15668161 is 16186651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15649936 + 18225 = 3956^2 + 135^2 .

It is a cyclic number.

It is not a de Polignac number, because 15668161 - 2³ = 15668153 is a prime.

It is not a weakly prime, because it can be changed into another prime (15668111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7834080 + 7834081.

It is an arithmetic number, because the mean of its divisors is an integer number (7834081).

Almost surely, 2^15668161 is an apocalyptic number.

It is an amenable number.

15668161 is a deficient number, since it is larger than the sum of its proper divisors (1).

15668161 is an equidigital number, since it uses as much as digits as its factorization.

15668161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 34.

The square root of 15668161 is about 3958.3027928646. The cubic root of 15668161 is about 250.2299803712.

The spelling of 15668161 in words is "fifteen million, six hundred sixty-eight thousand, one hundred sixty-one".