63664866 has 40 divisors (see below), whose sum is σ = 143591184. Its totient is φ = 21082680.

The previous prime is 63664817. The next prime is 63664879. The reversal of 63664866 is 66846636.

63664866 is a `hidden beast` number, since 636 + 6 + 4 + 8 + 6 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 25201 + ... + 27611.

Almost surely, 2^63664866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63664866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71795592).

63664866 is an abundant number, since it is smaller than the sum of its proper divisors (79926318).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63664866 is a wasteful number, since it uses less digits than its factorization.

63664866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2588 (or 2579 counting only the distinct ones).

The product of its digits is 746496, while the sum is 45.

The square root of 63664866 is about 7979.0266323656. The cubic root of 63664866 is about 399.3005819153.

The spelling of 63664866 in words is "sixty-three million, six hundred sixty-four thousand, eight hundred sixty-six".