666044023 has 4 divisors (see below), whose sum is σ = 674475040. Its totient is φ = 657613008.

The previous prime is 666044009. The next prime is 666044033. The reversal of 666044023 is 320440666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 666044023 - 2⁵ = 666043991 is a prime.

It is a super-2 number, since 2×666044023² = 887229281148049058, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666044033) 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 3 ways as a sum of consecutive naturals, for example, 4215390 + ... + 4215547.

It is an arithmetic number, because the mean of its divisors is an integer number (168618760).

Almost surely, 2^666044023 is an apocalyptic number.

666044023 is a deficient number, since it is larger than the sum of its proper divisors (8431017).

666044023 is an equidigital number, since it uses as much as digits as its factorization.

666044023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8431016.

The product of its (nonzero) digits is 20736, while the sum is 31.

The square root of 666044023 is about 25807.8287153336. The cubic root of 666044023 is about 873.3084153520.

Adding to 666044023 its reverse (320440666), we get a palindrome (986484689).

The spelling of 666044023 in words is "six hundred sixty-six million, forty-four thousand, twenty-three".