665674123 has 2 divisors, whose sum is σ = 665674124. Its totient is φ = 665674122.

The previous prime is 665674111. The next prime is 665674147. The reversal of 665674123 is 321476566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 665674123 - 2⁹ = 665673611 is a prime.

It is not a weakly prime, because it can be changed into another prime (665674103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332837061 + 332837062.

It is an arithmetic number, because the mean of its divisors is an integer number (332837062).

Almost surely, 2^665674123 is an apocalyptic number.

665674123 is a deficient number, since it is larger than the sum of its proper divisors (1).

665674123 is an equidigital number, since it uses as much as digits as its factorization.

665674123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 40.

The square root of 665674123 is about 25800.6612899747. The cubic root of 665674123 is about 873.1467160290.

The spelling of 665674123 in words is "six hundred sixty-five million, six hundred seventy-four thousand, one hundred twenty-three".