15660061 has 4 divisors (see below), whose sum is σ = 15673500. Its totient is φ = 15646624.

The previous prime is 15660031. The next prime is 15660083. The reversal of 15660061 is 16006651.

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 14394436 + 1265625 = 3794^2 + 1125^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15660061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15660031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4786 + ... + 7363.

It is an arithmetic number, because the mean of its divisors is an integer number (3918375).

Almost surely, 2^15660061 is an apocalyptic number.

It is an amenable number.

15660061 is a deficient number, since it is larger than the sum of its proper divisors (13439).

15660061 is a wasteful number, since it uses less digits than its factorization.

15660061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13438.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 15660061 is about 3957.2794948045. The cubic root of 15660061 is about 250.1868523101.

The spelling of 15660061 in words is "fifteen million, six hundred sixty thousand, sixty-one".