13265566503401 has 4 divisors (see below), whose sum is σ = 13265809994052. Its totient is φ = 13265323012752.

The previous prime is 13265566503257. The next prime is 13265566503419. The reversal of 13265566503401 is 10430566556231.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5779191960025 + 7486374543376 = 2403995^2 + 2736124^2 .

It is a cyclic number.

It is not a de Polignac number, because 13265566503401 - 2⁴² = 8867519992297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13265566503421) 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, 121663586 + ... + 121772571.

It is an arithmetic number, because the mean of its divisors is an integer number (3316452498513).

Almost surely, 2^{13265566503401} is an apocalyptic number.

It is an amenable number.

13265566503401 is a deficient number, since it is larger than the sum of its proper divisors (243490651).

13265566503401 is an equidigital number, since it uses as much as digits as its factorization.

13265566503401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243490650.

The product of its (nonzero) digits is 1944000, while the sum is 47.

The spelling of 13265566503401 in words is "thirteen trillion, two hundred sixty-five billion, five hundred sixty-six million, five hundred three thousand, four hundred one".