11261566913 has 4 divisors (see below), whose sum is σ = 11342585520. Its totient is φ = 11180548308.

The previous prime is 11261566873. The next prime is 11261566937. The reversal of 11261566913 is 31966516211.

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 11261566913 - 2²⁴ = 11244789697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11261566213) 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, 40509095 + ... + 40509372.

It is an arithmetic number, because the mean of its divisors is an integer number (2835646380).

Almost surely, 2^11261566913 is an apocalyptic number.

It is an amenable number.

11261566913 is a deficient number, since it is larger than the sum of its proper divisors (81018607).

11261566913 is an equidigital number, since it uses as much as digits as its factorization.

11261566913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81018606.

The product of its digits is 58320, while the sum is 41.

The spelling of 11261566913 in words is "eleven billion, two hundred sixty-one million, five hundred sixty-six thousand, nine hundred thirteen".