111801332161 has 4 divisors (see below), whose sum is σ = 111836175300. Its totient is φ = 111766489024.

The previous prime is 111801332131. The next prime is 111801332171. The reversal of 111801332161 is 161233108111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 95629377600 + 16171954561 = 309240^2 + 127169^2 .

It is a cyclic number.

It is not a de Polignac number, because 111801332161 - 2⁷ = 111801332033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111801332101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17416756 + ... + 17423173.

It is an arithmetic number, because the mean of its divisors is an integer number (27959043825).

Almost surely, 2^111801332161 is an apocalyptic number.

It is an amenable number.

111801332161 is a deficient number, since it is larger than the sum of its proper divisors (34843139).

111801332161 is an equidigital number, since it uses as much as digits as its factorization.

111801332161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34843138.

The product of its (nonzero) digits is 864, while the sum is 28.

The spelling of 111801332161 in words is "one hundred eleven billion, eight hundred one million, three hundred thirty-two thousand, one hundred sixty-one".