666887723 has 2 divisors, whose sum is σ = 666887724. Its totient is φ = 666887722.

The previous prime is 666887701. The next prime is 666887789. The reversal of 666887723 is 327788666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666887723 - 2⁶ = 666887659 is a prime.

It is not a weakly prime, because it can be changed into another prime (666887623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333443861 + 333443862.

It is an arithmetic number, because the mean of its divisors is an integer number (333443862).

Almost surely, 2^666887723 is an apocalyptic number.

666887723 is a deficient number, since it is larger than the sum of its proper divisors (1).

666887723 is an equidigital number, since it uses as much as digits as its factorization.

666887723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4064256, while the sum is 53.

The square root of 666887723 is about 25824.1693574063. The cubic root of 666887723 is about 873.6770093134.

The spelling of 666887723 in words is "six hundred sixty-six million, eight hundred eighty-seven thousand, seven hundred twenty-three".