13662602521 has 2 divisors, whose sum is σ = 13662602522. Its totient is φ = 13662602520.

The previous prime is 13662602519. The next prime is 13662602543. The reversal of 13662602521 is 12520626631.

13662602521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7838623296 + 5823979225 = 88536^2 + 76315^2 .

It is a cyclic number.

It is not a de Polignac number, because 13662602521 - 2¹ = 13662602519 is a prime.

Together with 13662602519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (13662602561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6831301260 + 6831301261.

It is an arithmetic number, because the mean of its divisors is an integer number (6831301261).

Almost surely, 2^13662602521 is an apocalyptic number.

It is an amenable number.

13662602521 is a deficient number, since it is larger than the sum of its proper divisors (1).

13662602521 is an equidigital number, since it uses as much as digits as its factorization.

13662602521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 34.

The spelling of 13662602521 in words is "thirteen billion, six hundred sixty-two million, six hundred two thousand, five hundred twenty-one".