11555116889 has 2 divisors, whose sum is σ = 11555116890. Its totient is φ = 11555116888.

The previous prime is 11555116883. The next prime is 11555116891. The reversal of 11555116889 is 98861155511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6916417225 + 4638699664 = 83165^2 + 68108^2 .

It is a cyclic number.

It is not a de Polignac number, because 11555116889 - 2⁴ = 11555116873 is a prime.

Together with 11555116891, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11555116883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5777558444 + 5777558445.

It is an arithmetic number, because the mean of its divisors is an integer number (5777558445).

Almost surely, 2^11555116889 is an apocalyptic number.

It is an amenable number.

11555116889 is a deficient number, since it is larger than the sum of its proper divisors (1).

11555116889 is an equidigital number, since it uses as much as digits as its factorization.

11555116889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432000, while the sum is 50.

The spelling of 11555116889 in words is "eleven billion, five hundred fifty-five million, one hundred sixteen thousand, eight hundred eighty-nine".