15166561 has 4 divisors (see below), whose sum is σ = 15268500. Its totient is φ = 15064624.

The previous prime is 15166549. The next prime is 15166583. The reversal of 15166561 is 16566151.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3876961 + 11289600 = 1969^2 + 3360^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15166561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15166531) 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 in 3 ways as a sum of consecutive naturals, for example, 50746 + ... + 51043.

It is an arithmetic number, because the mean of its divisors is an integer number (3817125).

Almost surely, 2^15166561 is an apocalyptic number.

It is an amenable number.

15166561 is a deficient number, since it is larger than the sum of its proper divisors (101939).

15166561 is a wasteful number, since it uses less digits than its factorization.

15166561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101938.

The product of its digits is 5400, while the sum is 31.

The square root of 15166561 is about 3894.4269154781. The cubic root of 15166561 is about 247.5306821806.

The spelling of 15166561 in words is "fifteen million, one hundred sixty-six thousand, five hundred sixty-one".