666800023 has 2 divisors, whose sum is σ = 666800024. Its totient is φ = 666800022.

The previous prime is 666799963. The next prime is 666800033. The reversal of 666800023 is 320008666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 666800023 - 2¹³ = 666791831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666800033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333400011 + 333400012.

It is an arithmetic number, because the mean of its divisors is an integer number (333400012).

Almost surely, 2^666800023 is an apocalyptic number.

666800023 is a deficient number, since it is larger than the sum of its proper divisors (1).

666800023 is an equidigital number, since it uses as much as digits as its factorization.

666800023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 666800023 is about 25822.4712798756. The cubic root of 666800023 is about 873.6387095966.

Adding to 666800023 its reverse (320008666), we get a palindrome (986808689).

The spelling of 666800023 in words is "six hundred sixty-six million, eight hundred thousand, twenty-three".