11165061881 has 2 divisors, whose sum is σ = 11165061882. Its totient is φ = 11165061880.

The previous prime is 11165061839. The next prime is 11165061893. The reversal of 11165061881 is 18816056111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10462016656 + 703045225 = 102284^2 + 26515^2 .

It is a cyclic number.

It is not a de Polignac number, because 11165061881 - 2²⁶ = 11097953017 is a prime.

It is a super-2 number, since 2×11165061881² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11165061581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5582530940 + 5582530941.

It is an arithmetic number, because the mean of its divisors is an integer number (5582530941).

Almost surely, 2^11165061881 is an apocalyptic number.

It is an amenable number.

11165061881 is a deficient number, since it is larger than the sum of its proper divisors (1).

11165061881 is an equidigital number, since it uses as much as digits as its factorization.

11165061881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 38.

The spelling of 11165061881 in words is "eleven billion, one hundred sixty-five million, sixty-one thousand, eight hundred eighty-one".