111643539085 has 32 divisors (see below), whose sum is σ = 152801988192. Its totient is φ = 77575864320.

The previous prime is 111643539037. The next prime is 111643539101. The reversal of 111643539085 is 580935346111.

It can be written as a sum of positive squares in 16 ways, for example, as 43498524969 + 68145014116 = 208563^2 + 261046^2 .

It is not a de Polignac number, because 111643539085 - 2¹⁷ = 111643408013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5732965 + ... + 5752405.

It is an arithmetic number, because the mean of its divisors is an integer number (4775062131).

Almost surely, 2^111643539085 is an apocalyptic number.

It is an amenable number.

111643539085 is a deficient number, since it is larger than the sum of its proper divisors (41158449107).

111643539085 is a wasteful number, since it uses less digits than its factorization.

111643539085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24673.

The product of its (nonzero) digits is 388800, while the sum is 46.

The spelling of 111643539085 in words is "one hundred eleven billion, six hundred forty-three million, five hundred thirty-nine thousand, eighty-five".