663986530 has 16 divisors (see below), whose sum is σ = 1201246200. Its totient is φ = 264245632.

The previous prime is 663986509. The next prime is 663986537. The reversal of 663986530 is 35689366.

It can be written as a sum of positive squares in 4 ways, for example, as 629658649 + 34327881 = 25093^2 + 5859^2 .

It is a super-2 number, since 2×663986530² = 881756224042881800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (663986537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166555 + ... + 170494.

Almost surely, 2^663986530 is an apocalyptic number.

663986530 is a deficient number, since it is larger than the sum of its proper divisors (537259670).

663986530 is a wasteful number, since it uses less digits than its factorization.

663986530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337253.

The product of its (nonzero) digits is 699840, while the sum is 46.

The square root of 663986530 is about 25767.9360834352. The cubic root of 663986530 is about 872.4082349447.

The spelling of 663986530 in words is "six hundred sixty-three million, nine hundred eighty-six thousand, five hundred thirty".