63669865887 has 24 divisors (see below), whose sum is σ = 100393471360. Its totient is φ = 40212543960.

The previous prime is 63669865843. The next prime is 63669865913. The reversal of 63669865887 is 78856896636.

63669865887 is a `hidden beast` number, since 6 + 36 + 6 + 9 + 8 + 6 + 588 + 7 = 666.

It is not a de Polignac number, because 63669865887 - 2⁶ = 63669865823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63669861887) 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 23 ways as a sum of consecutive naturals, for example, 6890539 + ... + 6899772.

Almost surely, 2^63669865887 is an apocalyptic number.

63669865887 is a deficient number, since it is larger than the sum of its proper divisors (36723605473).

63669865887 is a wasteful number, since it uses less digits than its factorization.

63669865887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13790345 (or 13790333 counting only the distinct ones).

The product of its digits is 627056640, while the sum is 72.

The spelling of 63669865887 in words is "sixty-three billion, six hundred sixty-nine million, eight hundred sixty-five thousand, eight hundred eighty-seven".