663211989 has 32 divisors (see below), whose sum is σ = 1082954880. Its totient is φ = 397785600.

The previous prime is 663211987. The next prime is 663211999. The reversal of 663211989 is 989112366.

It is a happy number.

663211989 is a `hidden beast` number, since 6 + 632 + 1 + 1 + 9 + 8 + 9 = 666.

It is not a de Polignac number, because 663211989 - 2¹ = 663211987 is a prime.

It is a super-2 number, since 2×663211989² = 879700284706672242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663211987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17299 + ... + 40319.

It is an arithmetic number, because the mean of its divisors is an integer number (33842340).

Almost surely, 2^663211989 is an apocalyptic number.

It is an amenable number.

663211989 is a deficient number, since it is larger than the sum of its proper divisors (419742891).

663211989 is a wasteful number, since it uses less digits than its factorization.

663211989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23138 (or 23132 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 663211989 is about 25752.9025354425. The cubic root of 663211989 is about 872.0688812441.

The spelling of 663211989 in words is "six hundred sixty-three million, two hundred eleven thousand, nine hundred eighty-nine".