663884986 has 8 divisors (see below), whose sum is σ = 1054405620. Its totient is φ = 312416448.

The previous prime is 663884983. The next prime is 663884987. The reversal of 663884986 is 689488366.

It can be written as a sum of positive squares in 2 ways, for example, as 661466961 + 2418025 = 25719^2 + 1555^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 663884986.

It is not an unprimeable number, because it can be changed into a prime (663884981) 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, 9762981 + ... + 9763048.

Almost surely, 2^663884986 is an apocalyptic number.

663884986 is a deficient number, since it is larger than the sum of its proper divisors (390520634).

663884986 is a wasteful number, since it uses less digits than its factorization.

663884986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19526048.

The product of its digits is 11943936, while the sum is 58.

The square root of 663884986 is about 25765.9656523873. The cubic root of 663884986 is about 872.3637599771.

The spelling of 663884986 in words is "six hundred sixty-three million, eight hundred eighty-four thousand, nine hundred eighty-six".