666866088 has 128 divisors (see below), whose sum is σ = 2160480000. Its totient is φ = 190512000.

The previous prime is 666866077. The next prime is 666866099. The reversal of 666866088 is 880668666.

It is an interprime number because it is at equal distance from previous prime (666866077) and next prime (666866099).

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 69588 + ... + 78588.

It is an arithmetic number, because the mean of its divisors is an integer number (16878750).

Almost surely, 2^666866088 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 666866088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1080240000).

666866088 is an abundant number, since it is smaller than the sum of its proper divisors (1493613912).

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

666866088 is a wasteful number, since it uses less digits than its factorization.

666866088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9037 (or 9013 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 54.

The square root of 666866088 is about 25823.7504634784. The cubic root of 666866088 is about 873.6675613429.

The spelling of 666866088 in words is "six hundred sixty-six million, eight hundred sixty-six thousand, eighty-eight".