15206661 has 12 divisors (see below), whose sum is σ = 22183980. Its totient is φ = 10036800.

The previous prime is 15206651. The next prime is 15206671. The reversal of 15206661 is 16660251.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (15206651) and next prime (15206671).

It can be written as a sum of positive squares in 2 ways, for example, as 12744900 + 2461761 = 3570^2 + 1569^2 .

It is not a de Polignac number, because 15206661 - 2¹⁰ = 15205637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15206621) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7456 + ... + 9273.

It is an arithmetic number, because the mean of its divisors is an integer number (1848665).

Almost surely, 2^15206661 is an apocalyptic number.

It is an amenable number.

15206661 is a deficient number, since it is larger than the sum of its proper divisors (6977319).

15206661 is a wasteful number, since it uses less digits than its factorization.

15206661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16836 (or 16833 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 15206661 is about 3899.5718995808. The cubic root of 15206661 is about 247.7486451315.

The spelling of 15206661 in words is "fifteen million, two hundred six thousand, six hundred sixty-one".