669646111 has 2 divisors, whose sum is σ = 669646112. Its totient is φ = 669646110.

The previous prime is 669646093. The next prime is 669646147. The reversal of 669646111 is 111646966.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 669646111 - 2²³ = 661257503 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669046111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334823055 + 334823056.

It is an arithmetic number, because the mean of its divisors is an integer number (334823056).

Almost surely, 2^669646111 is an apocalyptic number.

669646111 is a deficient number, since it is larger than the sum of its proper divisors (1).

669646111 is an equidigital number, since it uses as much as digits as its factorization.

669646111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 40.

The square root of 669646111 is about 25877.5213457549. The cubic root of 669646111 is about 874.8799230055.

The spelling of 669646111 in words is "six hundred sixty-nine million, six hundred forty-six thousand, one hundred eleven".