666950868 has 192 divisors, whose sum is σ = 1916006400. Its totient is φ = 199779840.

The previous prime is 666950861. The next prime is 666950873. The reversal of 666950868 is 868059666.

666950868 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666950861) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5091163 + ... + 5091293.

It is an arithmetic number, because the mean of its divisors is an integer number (9979200).

Almost surely, 2^666950868 is an apocalyptic number.

666950868 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666950868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (958003200).

666950868 is an abundant number, since it is smaller than the sum of its proper divisors (1249055532).

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

666950868 is a wasteful number, since it uses less digits than its factorization.

666950868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267 (or 259 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 54.

The square root of 666950868 is about 25825.3919234539. The cubic root of 666950868 is about 873.7045834670.

The spelling of 666950868 in words is "six hundred sixty-six million, nine hundred fifty thousand, eight hundred sixty-eight".