13099252865521 has 3 divisors (see below), whose sum is σ = 13099256484811. Its totient is φ = 13099249246232.

The previous prime is 13099252865507. The next prime is 13099252865551. The reversal of 13099252865521 is 12556825299031.

The square root of 13099252865521 is 3619289.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 1263175935921 + 11836076929600 = 1123911^2 + 3440360^2 .

It is not a de Polignac number, because 13099252865521 - 2⁷ = 13099252865393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13099252865551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1809645 + ... + 5428933.

Almost surely, 2^{13099252865521} is an apocalyptic number.

13099252865521 is the 3619289-th square number.

13099252865521 is the 1809645-th centered octagonal number.

It is an amenable number.

13099252865521 is a deficient number, since it is larger than the sum of its proper divisors (3619290).

13099252865521 is an frugal number, since it uses more digits than its factorization.

13099252865521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7238578 (or 3619289 counting only the distinct ones).

The product of its (nonzero) digits is 11664000, while the sum is 58.

The spelling of 13099252865521 in words is "thirteen trillion, ninety-nine billion, two hundred fifty-two million, eight hundred sixty-five thousand, five hundred twenty-one".