63665966 has 16 divisors (see below), whose sum is σ = 117537504. Its totient is φ = 25186464.

The previous prime is 63665951. The next prime is 63665977. The reversal of 63665966 is 66956636.

It is a self number, because there is not a number n which added to its sum of digits gives 63665966.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 174725 + ... + 175088.

It is an arithmetic number, because the mean of its divisors is an integer number (7346094).

Almost surely, 2^63665966 is an apocalyptic number.

63665966 is a deficient number, since it is larger than the sum of its proper divisors (53871538).

63665966 is a wasteful number, since it uses less digits than its factorization.

63665966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349835.

The product of its digits is 1049760, while the sum is 47.

The square root of 63665966 is about 7979.0955627815. The cubic root of 63665966 is about 399.3028816040.

The spelling of 63665966 in words is "sixty-three million, six hundred sixty-five thousand, nine hundred sixty-six".