11111588861 has 2 divisors, whose sum is σ = 11111588862. Its totient is φ = 11111588860.

The previous prime is 11111588843. The next prime is 11111588863. The reversal of 11111588861 is 16888511111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5704780900 + 5406807961 = 75530^2 + 73531^2 .

It is a cyclic number.

It is not a de Polignac number, because 11111588861 - 2²⁶ = 11044479997 is a prime.

It is a super-3 number, since 3×11111588861³ (a number of 31 digits) contains 333 as substring.

Together with 11111588863, 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 (11111588863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5555794430 + 5555794431.

It is an arithmetic number, because the mean of its divisors is an integer number (5555794431).

Almost surely, 2^11111588861 is an apocalyptic number.

It is an amenable number.

11111588861 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111588861 is an equidigital number, since it uses as much as digits as its factorization.

11111588861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15360, while the sum is 41.

The spelling of 11111588861 in words is "eleven billion, one hundred eleven million, five hundred eighty-eight thousand, eight hundred sixty-one".