666015 has 16 divisors (see below), whose sum is σ = 1218048. Its totient is φ = 304416.

The previous prime is 666013. The next prime is 666019. The reversal of 666015 is 510666.

It is not a de Polignac number, because 666015 - 2¹ = 666013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666013) 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 15 ways as a sum of consecutive naturals, for example, 3067 + ... + 3276.

It is an arithmetic number, because the mean of its divisors is an integer number (76128).

2⁶⁶⁶⁰¹⁵ is an apocalyptic number.

666015 is a deficient number, since it is larger than the sum of its proper divisors (552033).

666015 is a wasteful number, since it uses less digits than its factorization.

666015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6358.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 666015 is about 816.0974206552. The cubic root of 666015 is about 87.3295730305.

The spelling of 666015 in words is "six hundred sixty-six thousand, fifteen".