663433949818 has 8 divisors (see below), whose sum is σ = 995156657748. Its totient is φ = 331715063904.

The previous prime is 663433949749. The next prime is 663433949831. The reversal of 663433949818 is 818949334366.

It can be written as a sum of positive squares in 2 ways, for example, as 654346712889 + 9087236929 = 808917^2 + 95327^2 .

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

It is a super-2 number, since 2×663433949818² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 663433949818.

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, 472771 + ... + 1245142.

Almost surely, 2^663433949818 is an apocalyptic number.

663433949818 is a deficient number, since it is larger than the sum of its proper divisors (331722707930).

663433949818 is a wasteful number, since it uses less digits than its factorization.

663433949818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1911008.

The product of its digits is 80621568, while the sum is 64.

The spelling of 663433949818 in words is "six hundred sixty-three billion, four hundred thirty-three million, nine hundred forty-nine thousand, eight hundred eighteen".