666326860 has 12 divisors (see below), whose sum is σ = 1399286448. Its totient is φ = 266530736.

The previous prime is 666326819. The next prime is 666326867. The reversal of 666326860 is 68623666.

It is not an unprimeable number, because it can be changed into a prime (666326867) 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, 16658152 + ... + 16658191.

It is an arithmetic number, because the mean of its divisors is an integer number (116607204).

Almost surely, 2^666326860 is an apocalyptic number.

It is an amenable number.

666326860 is an abundant number, since it is smaller than the sum of its proper divisors (732959588).

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

666326860 is a wasteful number, since it uses less digits than its factorization.

666326860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33316352 (or 33316350 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 43.

The square root of 666326860 is about 25813.3078081830. The cubic root of 666326860 is about 873.4320152785.

The spelling of 666326860 in words is "six hundred sixty-six million, three hundred twenty-six thousand, eight hundred sixty".