666220441 has 8 divisors (see below), whose sum is σ = 693235584. Its totient is φ = 639740400.

The previous prime is 666220433. The next prime is 666220453. The reversal of 666220441 is 144022666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 666220441 - 2³ = 666220433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666220421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131235 + ... + 136216.

It is an arithmetic number, because the mean of its divisors is an integer number (86654448).

Almost surely, 2^666220441 is an apocalyptic number.

It is an amenable number.

666220441 is a deficient number, since it is larger than the sum of its proper divisors (27015143).

666220441 is a wasteful number, since it uses less digits than its factorization.

666220441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267551.

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 666220441 is about 25811.2464053947. The cubic root of 666220441 is about 873.3855142212.

The spelling of 666220441 in words is "six hundred sixty-six million, two hundred twenty thousand, four hundred forty-one".