665044823 has 2 divisors, whose sum is σ = 665044824. Its totient is φ = 665044822.

The previous prime is 665044817. The next prime is 665044843. The reversal of 665044823 is 328440566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 665044823 - 2⁶ = 665044759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665044813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332522411 + 332522412.

It is an arithmetic number, because the mean of its divisors is an integer number (332522412).

Almost surely, 2^665044823 is an apocalyptic number.

665044823 is a deficient number, since it is larger than the sum of its proper divisors (1).

665044823 is an equidigital number, since it uses as much as digits as its factorization.

665044823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 138240, while the sum is 38.

The square root of 665044823 is about 25788.4629825044. The cubic root of 665044823 is about 872.8714840251.

The spelling of 665044823 in words is "six hundred sixty-five million, forty-four thousand, eight hundred twenty-three".