663819867 has 24 divisors (see below), whose sum is σ = 996318960. Its totient is φ = 441676800.

The previous prime is 663819851. The next prime is 663819901. The reversal of 663819867 is 768918366.

It is a happy number.

663819867 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 663819867 - 2⁴ = 663819851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (663819817) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 135867 + ... + 140667.

It is an arithmetic number, because the mean of its divisors is an integer number (41513290).

Almost surely, 2^663819867 is an apocalyptic number.

663819867 is a deficient number, since it is larger than the sum of its proper divisors (332499093).

663819867 is an equidigital number, since it uses as much as digits as its factorization.

663819867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5385 (or 5373 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 54.

The square root of 663819867 is about 25764.7019582995. The cubic root of 663819867 is about 872.3352363049.

The spelling of 663819867 in words is "six hundred sixty-three million, eight hundred nineteen thousand, eight hundred sixty-seven".