63668665 has 4 divisors (see below), whose sum is σ = 76402404. Its totient is φ = 50934928.

The previous prime is 63668653. The next prime is 63668701. The reversal of 63668665 is 56686636.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 38638656 + 25030009 = 6216^2 + 5003^2 .

It is a cyclic number.

It is not a de Polignac number, because 63668665 - 2⁷ = 63668537 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6366862 + ... + 6366871.

It is an arithmetic number, because the mean of its divisors is an integer number (19100601).

Almost surely, 2^63668665 is an apocalyptic number.

It is an amenable number.

63668665 is a deficient number, since it is larger than the sum of its proper divisors (12733739).

63668665 is a wasteful number, since it uses less digits than its factorization.

63668665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12733738.

The product of its digits is 933120, while the sum is 46.

The square root of 63668665 is about 7979.2646904336. The cubic root of 63668665 is about 399.3085240915.

The spelling of 63668665 in words is "sixty-three million, six hundred sixty-eight thousand, six hundred sixty-five".