663219923 has 2 divisors, whose sum is σ = 663219924. Its totient is φ = 663219922.

The previous prime is 663219911. The next prime is 663220007. The reversal of 663219923 is 329912366.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 663219923 - 2¹² = 663215827 is a prime.

It is not a weakly prime, because it can be changed into another prime (663219223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331609961 + 331609962.

It is an arithmetic number, because the mean of its divisors is an integer number (331609962).

Almost surely, 2^663219923 is an apocalyptic number.

663219923 is a deficient number, since it is larger than the sum of its proper divisors (1).

663219923 is an equidigital number, since it uses as much as digits as its factorization.

663219923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 104976, while the sum is 41.

The square root of 663219923 is about 25753.0565758708. The cubic root of 663219923 is about 872.0723587480.

The spelling of 663219923 in words is "six hundred sixty-three million, two hundred nineteen thousand, nine hundred twenty-three".