663643402 has 8 divisors (see below), whose sum is σ = 998092800. Its totient is φ = 330945804.

The previous prime is 663643373. The next prime is 663643411. The reversal of 663643402 is 204346366.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 437002 + ... + 438517.

It is an arithmetic number, because the mean of its divisors is an integer number (124761600).

Almost surely, 2^663643402 is an apocalyptic number.

663643402 is a deficient number, since it is larger than the sum of its proper divisors (334449398).

663643402 is a wasteful number, since it uses less digits than its factorization.

663643402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 875900.

The product of its (nonzero) digits is 62208, while the sum is 34.

The square root of 663643402 is about 25761.2771810716. The cubic root of 663643402 is about 872.2579310561.

Adding to 663643402 its reverse (204346366), we get a palindrome (867989768).

The spelling of 663643402 in words is "six hundred sixty-three million, six hundred forty-three thousand, four hundred two".