666355441 has 8 divisors (see below), whose sum is σ = 710307200. Its totient is φ = 623291760.

The previous prime is 666355427. The next prime is 666355451. The reversal of 666355441 is 144553666.

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 666355441 - 2¹¹ = 666353393 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 666355394 and 666355403.

It is not an unprimeable number, because it can be changed into a prime (666355451) 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, 220470 + ... + 223471.

It is an arithmetic number, because the mean of its divisors is an integer number (88788400).

Almost surely, 2^666355441 is an apocalyptic number.

It is an amenable number.

666355441 is a deficient number, since it is larger than the sum of its proper divisors (43951759).

666355441 is a wasteful number, since it uses less digits than its factorization.

666355441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444039.

The product of its digits is 259200, while the sum is 40.

The square root of 666355441 is about 25813.8614120399. The cubic root of 666355441 is about 873.4445032455. Note that the first 3 decimals are identical.

The spelling of 666355441 in words is "six hundred sixty-six million, three hundred fifty-five thousand, four hundred forty-one".