663444367 has 4 divisors (see below), whose sum is σ = 672532720. Its totient is φ = 654356016.

The previous prime is 663444349. The next prime is 663444389. The reversal of 663444367 is 763444366.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 663444367 - 2¹⁵ = 663411599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663444667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4544067 + ... + 4544212.

It is an arithmetic number, because the mean of its divisors is an integer number (168133180).

Almost surely, 2^663444367 is an apocalyptic number.

663444367 is a deficient number, since it is larger than the sum of its proper divisors (9088353).

663444367 is an equidigital number, since it uses as much as digits as its factorization.

663444367 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9088352.

The product of its digits is 870912, while the sum is 43.

The square root of 663444367 is about 25757.4138259259. The cubic root of 663444367 is about 872.1707219638.

Subtracting 663444367 from its reverse (763444366), we obtain a palindrome (99999999).

The spelling of 663444367 in words is "six hundred sixty-three million, four hundred forty-four thousand, three hundred sixty-seven".