666156 has 24 divisors (see below), whose sum is σ = 1591744. Its totient is φ = 216720.

The previous prime is 666143. The next prime is 666167. The reversal of 666156 is 651666.

It is an unprimeable number.

666156 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130 + ... + 1161.

2⁶⁶⁶¹⁵⁶ is an apocalyptic number.

It is an amenable number.

666156 is an abundant number, since it is smaller than the sum of its proper divisors (925588).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666156 is a wasteful number, since it uses less digits than its factorization.

666156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1341 (or 1339 counting only the distinct ones).

The product of its digits is 6480, while the sum is 30.

The square root of 666156 is about 816.1838028288. The cubic root of 666156 is about 87.3357353547.

The spelling of 666156 in words is "six hundred sixty-six thousand, one hundred fifty-six".