12445122520 has 64 divisors (see below), whose sum is σ = 28507658400. Its totient is φ = 4888258560.

The previous prime is 12445122517. The next prime is 12445122541. The reversal of 12445122520 is 2522154421.

It is a happy number.

It is a super-2 number, since 2×12445122520² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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, 2633760 + ... + 2638480.

Almost surely, 2^12445122520 is an apocalyptic number.

12445122520 is a gapful number since it is divisible by the number (10) 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 12445122520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14253829200).

12445122520 is an abundant number, since it is smaller than the sum of its proper divisors (16062535880).

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

12445122520 is a wasteful number, since it uses less digits than its factorization.

12445122520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5908 (or 5904 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 28.

Adding to 12445122520 its reverse (2522154421), we get a palindrome (14967276941).

The spelling of 12445122520 in words is "twelve billion, four hundred forty-five million, one hundred twenty-two thousand, five hundred twenty".