111121165665 has 48 divisors (see below), whose sum is σ = 198190998720. Its totient is φ = 57562807680.

The previous prime is 111121165591. The next prime is 111121165681. The reversal of 111121165665 is 566561121111.

It is not a de Polignac number, because 111121165665 - 2¹⁰ = 111121164641 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 185955 + ... + 506775.

It is an arithmetic number, because the mean of its divisors is an integer number (4128979140).

Almost surely, 2^111121165665 is an apocalyptic number.

111121165665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

111121165665 is a deficient number, since it is larger than the sum of its proper divisors (87069833055).

111121165665 is a wasteful number, since it uses less digits than its factorization.

111121165665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321054 (or 321051 counting only the distinct ones).

The product of its digits is 10800, while the sum is 36.

Adding to 111121165665 its reverse (566561121111), we get a palindrome (677682286776).

The spelling of 111121165665 in words is "one hundred eleven billion, one hundred twenty-one million, one hundred sixty-five thousand, six hundred sixty-five".