63865856836 has 18 divisors (see below), whose sum is σ = 118726409018. Its totient is φ = 30054520320.

The previous prime is 63865856779. The next prime is 63865856953.

It is a happy number.

63865856836 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 3 ways, for example, as 18535188736 + 45330668100 = 136144^2 + 212910^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27622485 + ... + 27624796.

Almost surely, 2^63865856836 is an apocalyptic number.

It is an amenable number.

63865856836 is a deficient number, since it is larger than the sum of its proper divisors (54860552182).

63865856836 is a wasteful number, since it uses less digits than its factorization.

63865856836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55247319 (or 55247300 counting only the distinct ones).

The product of its digits is 149299200, while the sum is 64.

The spelling of 63865856836 in words is "sixty-three billion, eight hundred sixty-five million, eight hundred fifty-six thousand, eight hundred thirty-six".