13526256643 has 4 divisors (see below), whose sum is σ = 13528281888. Its totient is φ = 13524231400.

The previous prime is 13526256631. The next prime is 13526256673. The reversal of 13526256643 is 34665262531.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13526256643 - 2⁹ = 13526256131 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13526256643.

It is not an unprimeable number, because it can be changed into a prime (13526256613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1002571 + ... + 1015972.

It is an arithmetic number, because the mean of its divisors is an integer number (3382070472).

Almost surely, 2^13526256643 is an apocalyptic number.

13526256643 is a deficient number, since it is larger than the sum of its proper divisors (2025245).

13526256643 is an equidigital number, since it uses as much as digits as its factorization.

13526256643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2025244.

The product of its digits is 777600, while the sum is 43.

The spelling of 13526256643 in words is "thirteen billion, five hundred twenty-six million, two hundred fifty-six thousand, six hundred forty-three".