666862660 has 12 divisors (see below), whose sum is σ = 1400411628. Its totient is φ = 266745056.

The previous prime is 666862643. The next prime is 666862661. The reversal of 666862660 is 66268666.

666862660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 373494276 + 293368384 = 19326^2 + 17128^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 666862660.

It is not an unprimeable number, because it can be changed into a prime (666862661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16671547 + ... + 16671586.

It is an arithmetic number, because the mean of its divisors is an integer number (116700969).

Almost surely, 2^666862660 is an apocalyptic number.

It is an amenable number.

666862660 is an abundant number, since it is smaller than the sum of its proper divisors (733548968).

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

666862660 is a wasteful number, since it uses less digits than its factorization.

666862660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33343142 (or 33343140 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 46.

The square root of 666862660 is about 25823.6840903849. The cubic root of 666862660 is about 873.6660643220. Note that the first 3 decimals are identical.

The spelling of 666862660 in words is "six hundred sixty-six million, eight hundred sixty-two thousand, six hundred sixty".