13261790668409 has 4 divisors (see below), whose sum is σ = 13262042985360. Its totient is φ = 13261538351460.

The previous prime is 13261790668369. The next prime is 13261790668447. The reversal of 13261790668409 is 90486609716231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13261790668409 - 2²⁰ = 13261789619833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13261790668909) 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, 126079619 + ... + 126184760.

It is an arithmetic number, because the mean of its divisors is an integer number (3315510746340).

Almost surely, 2^{13261790668409} is an apocalyptic number.

It is an amenable number.

13261790668409 is a deficient number, since it is larger than the sum of its proper divisors (252316951).

13261790668409 is an equidigital number, since it uses as much as digits as its factorization.

13261790668409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252316950.

The product of its (nonzero) digits is 23514624, while the sum is 62.

The spelling of 13261790668409 in words is "thirteen trillion, two hundred sixty-one billion, seven hundred ninety million, six hundred sixty-eight thousand, four hundred nine".