12521345526 has 64 divisors (see below), whose sum is σ = 28514745600. Its totient is φ = 4070642688.

The previous prime is 12521345497. The next prime is 12521345549. The reversal of 12521345526 is 62554312521.

12521345526 is a `hidden beast` number, since 125 + 2 + 1 + 3 + 4 + 5 + 526 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1712310 + ... + 1719606.

It is an arithmetic number, because the mean of its divisors is an integer number (445542900).

Almost surely, 2^12521345526 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12521345526, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14257372800).

12521345526 is an abundant number, since it is smaller than the sum of its proper divisors (15993400074).

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

12521345526 is a wasteful number, since it uses less digits than its factorization.

12521345526 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8090 (or 8084 counting only the distinct ones).

The product of its digits is 72000, while the sum is 36.

The spelling of 12521345526 in words is "twelve billion, five hundred twenty-one million, three hundred forty-five thousand, five hundred twenty-six".