663408388 has 12 divisors (see below), whose sum is σ = 1161207040. Its totient is φ = 331634952.

The previous prime is 663408359. The next prime is 663408397. The reversal of 663408388 is 883804366.

It is a super-2 number, since 2×663408388² = 880221378537517088, which contains 22 as substring.

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, 8533 + ... + 37411.

Almost surely, 2^663408388 is an apocalyptic number.

It is an amenable number.

663408388 is a deficient number, since it is larger than the sum of its proper divisors (497798652).

663408388 is a wasteful number, since it uses less digits than its factorization.

663408388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34626 (or 34624 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 46.

The square root of 663408388 is about 25756.7153961836. The cubic root of 663408388 is about 872.1549555588.

The spelling of 663408388 in words is "six hundred sixty-three million, four hundred eight thousand, three hundred eighty-eight".