63866666836 has 36 divisors (see below), whose sum is σ = 131301596916. Its totient is φ = 27100416000.

The previous prime is 63866666833. The next prime is 63866666839.

63866666836 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (63866666833) and next prime (63866666839).

It can be written as a sum of positive squares in 2 ways, for example, as 63046188100 + 820478736 = 251090^2 + 28644^2 .

It is a super-2 number, since 2×63866666836² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63866666833) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1593325 + ... + 1632916.

It is an arithmetic number, because the mean of its divisors is an integer number (3647266581).

Almost surely, 2^63866666836 is an apocalyptic number.

It is an amenable number.

63866666836 is an abundant number, since it is smaller than the sum of its proper divisors (67434930080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63866666836 is a wasteful number, since it uses less digits than its factorization.

63866666836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3226360 (or 3226351 counting only the distinct ones).

The product of its digits is 161243136, while the sum is 64.

The spelling of 63866666836 in words is "sixty-three billion, eight hundred sixty-six million, six hundred sixty-six thousand, eight hundred thirty-six".