12536221500 has 768 divisors, whose sum is σ = 47551795200. Its totient is φ = 2822400000.

The previous prime is 12536221427. The next prime is 12536221501. The reversal of 12536221500 is 512263521.

It is a happy number.

12536221500 is a `hidden beast` number, since 1 + 25 + 3 + 622 + 15 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12536221501) by changing a digit.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 176566465 + ... + 176566535.

It is an arithmetic number, because the mean of its divisors is an integer number (61916400).

Almost surely, 2^12536221500 is an apocalyptic number.

12536221500 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 12536221500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23775897600).

12536221500 is an abundant number, since it is smaller than the sum of its proper divisors (35015573700).

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

12536221500 is a wasteful number, since it uses less digits than its factorization.

12536221500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180 (or 162 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The spelling of 12536221500 in words is "twelve billion, five hundred thirty-six million, two hundred twenty-one thousand, five hundred".