2015666 has 8 divisors (see below), whose sum is σ = 3052080. Its totient is φ = 998308.

The previous prime is 2015633. The next prime is 2015669. The reversal of 2015666 is 6665102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (2015669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4496 + ... + 4923.

It is an arithmetic number, because the mean of its divisors is an integer number (381510).

2^2015666 is an apocalyptic number.

2015666 is a deficient number, since it is larger than the sum of its proper divisors (1036414).

2015666 is a wasteful number, since it uses less digits than its factorization.

2015666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9528.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 2015666 is about 1419.7415257715. The cubic root of 2015666 is about 126.3202151654.

The spelling of 2015666 in words is "two million, fifteen thousand, six hundred sixty-six".