11567444261 has 2 divisors, whose sum is σ = 11567444262. Its totient is φ = 11567444260.

The previous prime is 11567444209. The next prime is 11567444263. The reversal of 11567444261 is 16244476511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10636828225 + 930616036 = 103135^2 + 30506^2 .

It is an emirp because it is prime and its reverse (16244476511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11567444261 - 2²⁶ = 11500335397 is a prime.

It is a super-2 number, since 2×11567444261² (a number of 21 digits) contains 22 as substring.

Together with 11567444263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11567444263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5783722130 + 5783722131.

It is an arithmetic number, because the mean of its divisors is an integer number (5783722131).

Almost surely, 2^11567444261 is an apocalyptic number.

It is an amenable number.

11567444261 is a deficient number, since it is larger than the sum of its proper divisors (1).

11567444261 is an equidigital number, since it uses as much as digits as its factorization.

11567444261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 41.

The spelling of 11567444261 in words is "eleven billion, five hundred sixty-seven million, four hundred forty-four thousand, two hundred sixty-one".