1243312866432 has 576 divisors, whose sum is σ = 4532629865400. Its totient is φ = 324205314048.

The previous prime is 1243312866379. The next prime is 1243312866443. The reversal of 1243312866432 is 2346682133421.

1243312866432 is a `hidden beast` number, since 1 + 2 + 4 + 33 + 128 + 66 + 432 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 245120049216 + 998192817216 = 495096^2 + 999096^2 .

It is a tau number, because it is divible by the number of its divisors (576).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 65300818 + ... + 65319854.

Almost surely, 2^{1243312866432} is an apocalyptic number.

1243312866432 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1243312866432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2266314932700).

1243312866432 is an abundant number, since it is smaller than the sum of its proper divisors (3289316998968).

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

1243312866432 is a wasteful number, since it uses less digits than its factorization.

1243312866432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19173 (or 19151 counting only the distinct ones).

The product of its digits is 995328, while the sum is 45.

Adding to 1243312866432 its reverse (2346682133421), we get a palindrome (3589994999853).

The spelling of 1243312866432 in words is "one trillion, two hundred forty-three billion, three hundred twelve million, eight hundred sixty-six thousand, four hundred thirty-two".