666666156 has 48 divisors (see below), whose sum is σ = 1677408768. Its totient is φ = 204859200.

The previous prime is 666666151. The next prime is 666666163. The reversal of 666666156 is 651666666.

666666156 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (666666151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139771 + ... + 144461.

It is an arithmetic number, because the mean of its divisors is an integer number (34946016).

Almost surely, 2^666666156 is an apocalyptic number.

It is an amenable number.

666666156 is an abundant number, since it is smaller than the sum of its proper divisors (1010742612).

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

666666156 is a wasteful number, since it uses less digits than its factorization.

666666156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5622 (or 5620 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 48.

The square root of 666666156 is about 25819.8790856967. The cubic root of 666666156 is about 873.5802416820.

The spelling of 666666156 in words is "six hundred sixty-six million, six hundred sixty-six thousand, one hundred fifty-six".