111572351757161 has 4 divisors (see below), whose sum is σ = 111816492571092. Its totient is φ = 111328210943232.

The previous prime is 111572351757157. The next prime is 111572351757203. The reversal of 111572351757161 is 161757153275111.

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 103856073360400 + 7716278396761 = 10190980^2 + 2777819^2 .

It is a cyclic number.

It is not a de Polignac number, because 111572351757161 - 2² = 111572351757157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (111572351757101) 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, 122070406280 + ... + 122070407193.

It is an arithmetic number, because the mean of its divisors is an integer number (27954123142773).

Almost surely, 2^{111572351757161} is an apocalyptic number.

It is an amenable number.

111572351757161 is a deficient number, since it is larger than the sum of its proper divisors (244140813931).

111572351757161 is an equidigital number, since it uses as much as digits as its factorization.

111572351757161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244140813930.

The product of its digits is 1543500, while the sum is 53.

The spelling of 111572351757161 in words is "one hundred eleven trillion, five hundred seventy-two billion, three hundred fifty-one million, seven hundred fifty-seven thousand, one hundred sixty-one".