13266238520 has 128 divisors (see below), whose sum is σ = 32419353600. Its totient is φ = 4869849600.

The previous prime is 13266238499. The next prime is 13266238537. The reversal of 13266238520 is 2583266231.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (38).

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, 3103985 + ... + 3108255.

It is an arithmetic number, because the mean of its divisors is an integer number (253276200).

Almost surely, 2^13266238520 is an apocalyptic number.

13266238520 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 13266238520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16209676800).

13266238520 is an abundant number, since it is smaller than the sum of its proper divisors (19153115080).

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

13266238520 is a wasteful number, since it uses less digits than its factorization.

13266238520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4429 (or 4425 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 38.

The spelling of 13266238520 in words is "thirteen billion, two hundred sixty-six million, two hundred thirty-eight thousand, five hundred twenty".