63663997 has 4 divisors (see below), whose sum is σ = 67408956. Its totient is φ = 59919040.

The previous prime is 63663979. The next prime is 63664001. The reversal of 63663997 is 79936636.

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 26563716 + 37100281 = 5154^2 + 6091^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63663997 is a prime.

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 63663997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63663947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1872454 + ... + 1872487.

It is an arithmetic number, because the mean of its divisors is an integer number (16852239).

Almost surely, 2^63663997 is an apocalyptic number.

It is an amenable number.

63663997 is a deficient number, since it is larger than the sum of its proper divisors (3744959).

63663997 is a wasteful number, since it uses less digits than its factorization.

63663997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3744958.

The product of its digits is 1102248, while the sum is 49.

The square root of 63663997 is about 7978.9721769160. The cubic root of 63663997 is about 399.2987651426.

The spelling of 63663997 in words is "sixty-three million, six hundred sixty-three thousand, nine hundred ninety-seven".