1155110111881 has 24 divisors (see below), whose sum is σ = 1316893023432. Its totient is φ = 1011602592000.

The previous prime is 1155110111879. The next prime is 1155110111921. The reversal of 1155110111881 is 1881110115511.

It can be written as a sum of positive squares in 4 ways, for example, as 424692035856 + 730418076025 = 651684^2 + 854645^2 .

It is not a de Polignac number, because 1155110111881 - 2¹ = 1155110111879 is a prime.

It is a super-2 number, since 2×1155110111881² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1155110111861) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 825100 + ... + 1729453.

It is an arithmetic number, because the mean of its divisors is an integer number (54870542643).

Almost surely, 2^{1155110111881} is an apocalyptic number.

1155110111881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1155110111881 is a deficient number, since it is larger than the sum of its proper divisors (161782911551).

1155110111881 is a wasteful number, since it uses less digits than its factorization.

1155110111881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2554713 (or 2554702 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 34.

The spelling of 1155110111881 in words is "one trillion, one hundred fifty-five billion, one hundred ten million, one hundred eleven thousand, eight hundred eighty-one".