111553433261 has 4 divisors (see below), whose sum is σ = 111582121500. Its totient is φ = 111524745024.

The previous prime is 111553433221. The next prime is 111553433273. The reversal of 111553433261 is 162334355111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 162334355111 = 37 ⋅4387415003.

It can be written as a sum of positive squares in 2 ways, for example, as 95039641225 + 16513792036 = 308285^2 + 128506^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111553433261 is a prime.

It is a super-3 number, since 3×111553433261³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111553433221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14338286 + ... + 14346063.

It is an arithmetic number, because the mean of its divisors is an integer number (27895530375).

Almost surely, 2^111553433261 is an apocalyptic number.

It is an amenable number.

111553433261 is a deficient number, since it is larger than the sum of its proper divisors (28688239).

111553433261 is an equidigital number, since it uses as much as digits as its factorization.

111553433261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28688238.

The product of its digits is 32400, while the sum is 35.

Adding to 111553433261 its reverse (162334355111), we get a palindrome (273887788372).

The spelling of 111553433261 in words is "one hundred eleven billion, five hundred fifty-three million, four hundred thirty-three thousand, two hundred sixty-one".