666828666 has 32 divisors (see below), whose sum is σ = 1693534080. Its totient is φ = 190522368.

The previous prime is 666828653. The next prime is 666828683.

666828666 is nontrivially palindromic in base 10.

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 (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 881671 + ... + 882426.

It is an arithmetic number, because the mean of its divisors is an integer number (52922940).

Almost surely, 2^666828666 is an apocalyptic number.

666828666 is an abundant number, since it is smaller than the sum of its proper divisors (1026705414).

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

666828666 is a wasteful number, since it uses less digits than its factorization.

666828666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1764115 (or 1764109 counting only the distinct ones).

The product of its digits is 5971968, while the sum is 54.

The square root of 666828666 is about 25823.0258877615. The cubic root of 666828666 is about 873.6512187320.

The spelling of 666828666 in words is "six hundred sixty-six million, eight hundred twenty-eight thousand, six hundred sixty-six".