63666989 has 6 divisors (see below), whose sum is σ = 67632714. Its totient is φ = 59921600.

The previous prime is 63666947. The next prime is 63666991. The reversal of 63666989 is 98966636.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 32775625 + 30891364 = 5725^2 + 5558^2 .

It is not a de Polignac number, because 63666989 - 2¹⁶ = 63601453 is a prime.

It is a super-2 number, since 2×63666989² = 8106970976652242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 63666989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63666389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 109862 + ... + 110439.

It is an arithmetic number, because the mean of its divisors is an integer number (11272119).

Almost surely, 2^63666989 is an apocalyptic number.

It is an amenable number.

63666989 is a deficient number, since it is larger than the sum of its proper divisors (3965725).

63666989 is a wasteful number, since it uses less digits than its factorization.

63666989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220335 (or 220318 counting only the distinct ones).

The product of its digits is 2519424, while the sum is 53.

The square root of 63666989 is about 7979.1596675339. The cubic root of 63666989 is about 399.3050202907.

The spelling of 63666989 in words is "sixty-three million, six hundred sixty-six thousand, nine hundred eighty-nine".