666418176 has 132 divisors (see below), whose sum is σ = 1940261232. Its totient is φ = 220299264.

The previous prime is 666418163. The next prime is 666418177. The reversal of 666418176 is 671814666.

It is a super-2 number, since 2×666418176² = 888226370606333952, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666418177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1538856 + ... + 1539288.

Almost surely, 2^666418176 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 666418176, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (970130616).

666418176 is an abundant number, since it is smaller than the sum of its proper divisors (1273843056).

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

666418176 is a wasteful number, since it uses less digits than its factorization.

666418176 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626 (or 605 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 666418176 is about 25815.0765251626. The cubic root of 666418176 is about 873.4719129521.

The spelling of 666418176 in words is "six hundred sixty-six million, four hundred eighteen thousand, one hundred seventy-six".