22861515816 has 144 divisors (see below), whose sum is σ = 68079447540. Its totient is φ = 7171960320.

The previous prime is 22861515797. The next prime is 22861515829. The reversal of 22861515816 is 61851516822.

22861515816 is a `hidden beast` number, since 2 + 2 + 8 + 61 + 5 + 1 + 581 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 22845113316 + 16402500 = 151146^2 + 4050^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 879486 + ... + 905106.

Almost surely, 2^22861515816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22861515816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34039723770).

22861515816 is an abundant number, since it is smaller than the sum of its proper divisors (45217931724).

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

22861515816 is an equidigital number, since it uses as much as digits as its factorization.

22861515816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25668 (or 25643 counting only the distinct ones).

The product of its digits is 230400, while the sum is 45.

The spelling of 22861515816 in words is "twenty-two billion, eight hundred sixty-one million, five hundred fifteen thousand, eight hundred sixteen".