12261533526 has 96 divisors (see below), whose sum is σ = 31516306848. Its totient is φ = 3402501120.

The previous prime is 12261533503. The next prime is 12261533527. The reversal of 12261533526 is 62533516221.

12261533526 is a `hidden beast` number, since 1 + 2 + 2 + 615 + 3 + 35 + 2 + 6 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12261533527) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 75316 + ... + 173768.

It is an arithmetic number, because the mean of its divisors is an integer number (328294863).

Almost surely, 2^12261533526 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12261533526, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15758153424).

12261533526 is an abundant number, since it is smaller than the sum of its proper divisors (19254773322).

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

12261533526 is a wasteful number, since it uses less digits than its factorization.

12261533526 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98526 (or 98523 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The spelling of 12261533526 in words is "twelve billion, two hundred sixty-one million, five hundred thirty-three thousand, five hundred twenty-six".