63665887 has 4 divisors (see below), whose sum is σ = 63718920. Its totient is φ = 63612856.

The previous prime is 63665881. The next prime is 63665923. The reversal of 63665887 is 78856636.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63665887 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 63665887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63665881) 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, 24673 + ... + 27130.

It is an arithmetic number, because the mean of its divisors is an integer number (15929730).

Almost surely, 2^63665887 is an apocalyptic number.

63665887 is a deficient number, since it is larger than the sum of its proper divisors (53033).

63665887 is a wasteful number, since it uses less digits than its factorization.

63665887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53032.

The product of its digits is 1451520, while the sum is 49.

The square root of 63665887 is about 7979.0906123442. The cubic root of 63665887 is about 399.3027164454.

The spelling of 63665887 in words is "sixty-three million, six hundred sixty-five thousand, eight hundred eighty-seven".