63664015 has 4 divisors (see below), whose sum is σ = 76396824. Its totient is φ = 50931208.

The previous prime is 63664001. The next prime is 63664039. The reversal of 63664015 is 51046636.

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

It is a cyclic number.

It is not a de Polignac number, because 63664015 - 2⁹ = 63663503 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent 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, 6366397 + ... + 6366406.

It is an arithmetic number, because the mean of its divisors is an integer number (19099206).

Almost surely, 2^63664015 is an apocalyptic number.

63664015 is a deficient number, since it is larger than the sum of its proper divisors (12732809).

63664015 is a wasteful number, since it uses less digits than its factorization.

63664015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12732808.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 63664015 is about 7978.9733048808. The cubic root of 63664015 is about 399.2988027744.

The spelling of 63664015 in words is "sixty-three million, six hundred sixty-four thousand, fifteen".