12581022336 has 128 divisors (see below), whose sum is σ = 34010357760. Its totient is φ = 4120058880.

The previous prime is 12581022271. The next prime is 12581022341. The reversal of 12581022336 is 63322018521.

It is a tau number, because it is divible by the number of its divisors (128).

It is a junction number, because it is equal to n+sod(n) for n = 12581022297 and 12581022306.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5216971 + ... + 5219381.

It is an arithmetic number, because the mean of its divisors is an integer number (265705920).

Almost surely, 2^12581022336 is an apocalyptic number.

12581022336 is a gapful number since it is divisible by the number (16) 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 12581022336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17005178880).

12581022336 is an abundant number, since it is smaller than the sum of its proper divisors (21429335424).

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

12581022336 is a wasteful number, since it uses less digits than its factorization.

12581022336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2662 (or 2650 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The spelling of 12581022336 in words is "twelve billion, five hundred eighty-one million, twenty-two thousand, three hundred thirty-six".