111256345161 has 18 divisors (see below), whose sum is σ = 174016337118. Its totient is φ = 68465442240.

The previous prime is 111256345159. The next prime is 111256345169. The reversal of 111256345161 is 161543652111.

111256345161 is a `hidden beast` number, since 1 + 1 + 1 + 2 + 5 + 634 + 5 + 16 + 1 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 63441225 + 111192903936 = 7965^2 + 333456^2 .

It is not a de Polignac number, because 111256345161 - 2¹ = 111256345159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (111256345169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 36571900 + ... + 36574941.

Almost surely, 2^111256345161 is an apocalyptic number.

It is an amenable number.

111256345161 is a deficient number, since it is larger than the sum of its proper divisors (62759991957).

111256345161 is a wasteful number, since it uses less digits than its factorization.

111256345161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73146873 (or 73146857 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

Adding to 111256345161 its reverse (161543652111), we get a palindrome (272799997272).

The spelling of 111256345161 in words is "one hundred eleven billion, two hundred fifty-six million, three hundred forty-five thousand, one hundred sixty-one".