666767976 has 128 divisors (see below), whose sum is σ = 2034616320. Its totient is φ = 177940224.

The previous prime is 666767957. The next prime is 666768001. The reversal of 666767976 is 679767666.

666767976 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 31 ways as a sum of consecutive naturals, for example, 164146 + ... + 168158.

It is an arithmetic number, because the mean of its divisors is an integer number (15895440).

Almost surely, 2^666767976 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 666767976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1017308160).

666767976 is an abundant number, since it is smaller than the sum of its proper divisors (1367848344).

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

666767976 is a wasteful number, since it uses less digits than its factorization.

666767976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4095 (or 4091 counting only the distinct ones).

The product of its digits is 24004512, while the sum is 60.

The square root of 666767976 is about 25821.8507469933. The cubic root of 666767976 is about 873.6247134222.

The spelling of 666767976 in words is "six hundred sixty-six million, seven hundred sixty-seven thousand, nine hundred seventy-six".