663602403 has 4 divisors (see below), whose sum is σ = 884803208. Its totient is φ = 442401600.

The previous prime is 663602309. The next prime is 663602413. The reversal of 663602403 is 304206366.

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

It is not a de Polignac number, because 663602403 - 2¹⁸ = 663340259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (663602413) 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, 110600398 + ... + 110600403.

It is an arithmetic number, because the mean of its divisors is an integer number (221200802).

Almost surely, 2^663602403 is an apocalyptic number.

663602403 is a deficient number, since it is larger than the sum of its proper divisors (221200805).

663602403 is a wasteful number, since it uses less digits than its factorization.

663602403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221200804.

The product of its (nonzero) digits is 15552, while the sum is 30.

The square root of 663602403 is about 25760.4814201909. The cubic root of 663602403 is about 872.2399683775.

Adding to 663602403 its reverse (304206366), we get a palindrome (967808769).

The spelling of 663602403 in words is "six hundred sixty-three million, six hundred two thousand, four hundred three".