12866818624 has 63 divisors (see below), whose sum is σ = 28086540601. Its totient is φ = 5844016640.

The previous prime is 12866818619. The next prime is 12866818667. The reversal of 12866818624 is 42681866821.

It is a happy number.

The square root of 12866818624 is 113432.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 10438300224 + 2428518400 = 102168^2 + 49280^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 9981372 + ... + 9982660.

Almost surely, 2^12866818624 is an apocalyptic number.

12866818624 is the 113432-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12866818624

12866818624 is an abundant number, since it is smaller than the sum of its proper divisors (15219721977).

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

12866818624 is an frugal number, since it uses more digits than its factorization.

12866818624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2612 (or 1302 counting only the distinct ones).

The product of its digits is 1769472, while the sum is 52.

The spelling of 12866818624 in words is "twelve billion, eight hundred sixty-six million, eight hundred eighteen thousand, six hundred twenty-four".