12491023199436 has 72 divisors (see below), whose sum is σ = 32757183448080. Its totient is φ = 4161992663232.

The previous prime is 12491023199429. The next prime is 12491023199437. The reversal of 12491023199436 is 63499132019421.

12491023199436 is a `hidden beast` number, since 1 + 2 + 4 + 9 + 10 + 2 + 3 + 199 + 436 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (12491023199437) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 186391 + ... + 5001678.

Almost surely, 2^{12491023199436} 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 12491023199436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16378591724040).

12491023199436 is an abundant number, since it is smaller than the sum of its proper divisors (20266160248644).

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

12491023199436 is a wasteful number, since it uses less digits than its factorization.

12491023199436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5190565 (or 5190551 counting only the distinct ones).

The product of its (nonzero) digits is 2519424, while the sum is 54.

The spelling of 12491023199436 in words is "twelve trillion, four hundred ninety-one billion, twenty-three million, one hundred ninety-nine thousand, four hundred thirty-six".