13521666589 has 2 divisors, whose sum is σ = 13521666590. Its totient is φ = 13521666588.

The previous prime is 13521666577. The next prime is 13521666649. The reversal of 13521666589 is 98566612531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13054890564 + 466776025 = 114258^2 + 21605^2 .

It is a cyclic number.

It is not a de Polignac number, because 13521666589 - 2⁷ = 13521666461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13521666089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6760833294 + 6760833295.

It is an arithmetic number, because the mean of its divisors is an integer number (6760833295).

Almost surely, 2^13521666589 is an apocalyptic number.

It is an amenable number.

13521666589 is a deficient number, since it is larger than the sum of its proper divisors (1).

13521666589 is an equidigital number, since it uses as much as digits as its factorization.

13521666589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2332800, while the sum is 52.

The spelling of 13521666589 in words is "thirteen billion, five hundred twenty-one million, six hundred sixty-six thousand, five hundred eighty-nine".