666522156 has 48 divisors (see below), whose sum is σ = 1580705280. Its totient is φ = 218547840.

The previous prime is 666522113. The next prime is 666522163. The reversal of 666522156 is 651225666.

It is a happy number.

666522156 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 688785 + ... + 689751.

It is an arithmetic number, because the mean of its divisors is an integer number (32931360).

Almost surely, 2^666522156 is an apocalyptic number.

It is an amenable number.

666522156 is an abundant number, since it is smaller than the sum of its proper divisors (914183124).

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

666522156 is a wasteful number, since it uses less digits than its factorization.

666522156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1854 (or 1852 counting only the distinct ones).

The product of its digits is 129600, while the sum is 39.

The square root of 666522156 is about 25817.0903860214. The cubic root of 666522156 is about 873.5173393273.

The spelling of 666522156 in words is "six hundred sixty-six million, five hundred twenty-two thousand, one hundred fifty-six".