666156016 has 40 divisors (see below), whose sum is σ = 1372746960. Its totient is φ = 312075264.

The previous prime is 666155977. The next prime is 666156047. The reversal of 666156016 is 610651666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56350 + ... + 67138.

It is an arithmetic number, because the mean of its divisors is an integer number (34318674).

Almost surely, 2^666156016 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 666156016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (686373480).

666156016 is an abundant number, since it is smaller than the sum of its proper divisors (706590944).

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

666156016 is a wasteful number, since it uses less digits than its factorization.

666156016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11041 (or 11035 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 666156016 is about 25809.9983727237. The cubic root of 666156016 is about 873.3573605391.

The spelling of 666156016 in words is "six hundred sixty-six million, one hundred fifty-six thousand, sixteen".