663820823 has 2 divisors, whose sum is σ = 663820824. Its totient is φ = 663820822.

The previous prime is 663820793. The next prime is 663820877. The reversal of 663820823 is 328028366.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 663820823 - 2²⁶ = 596711959 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663820123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331910411 + 331910412.

It is an arithmetic number, because the mean of its divisors is an integer number (331910412).

Almost surely, 2^663820823 is an apocalyptic number.

663820823 is a deficient number, since it is larger than the sum of its proper divisors (1).

663820823 is an equidigital number, since it uses as much as digits as its factorization.

663820823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82944, while the sum is 38.

The square root of 663820823 is about 25764.7205108070. The cubic root of 663820823 is about 872.3356550692.

The spelling of 663820823 in words is "six hundred sixty-three million, eight hundred twenty thousand, eight hundred twenty-three".