666906156 has 192 divisors, whose sum is σ = 2153088000. Its totient is φ = 174182400.

The previous prime is 666906143. The next prime is 666906179. The reversal of 666906156 is 651609666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 415756 + ... + 417356.

It is an arithmetic number, because the mean of its divisors is an integer number (11214000).

Almost surely, 2^666906156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666906156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1076544000).

666906156 is an abundant number, since it is smaller than the sum of its proper divisors (1486181844).

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

666906156 is a wasteful number, since it uses less digits than its factorization.

666906156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1669 (or 1661 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The square root of 666906156 is about 25824.5262492848. The cubic root of 666906156 is about 873.6850588143.

The spelling of 666906156 in words is "six hundred sixty-six million, nine hundred six thousand, one hundred fifty-six".