666356418 has 48 divisors (see below), whose sum is σ = 1776954816. Its totient is φ = 175741920.

The previous prime is 666356401. The next prime is 666356419. The reversal of 666356418 is 814653666.

It is not an unprimeable number, because it can be changed into a prime (666356419) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 201768 + ... + 205043.

It is an arithmetic number, because the mean of its divisors is an integer number (37019892).

Almost surely, 2^666356418 is an apocalyptic number.

666356418 is an abundant number, since it is smaller than the sum of its proper divisors (1110598398).

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

666356418 is a wasteful number, since it uses less digits than its factorization.

666356418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406839 (or 406836 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The square root of 666356418 is about 25813.8803359743. The cubic root of 666356418 is about 873.4449301222. Note that the first 3 decimals are identical.

The spelling of 666356418 in words is "six hundred sixty-six million, three hundred fifty-six thousand, four hundred eighteen".