111561516172207 has 4 divisors (see below), whose sum is σ = 111617888845320. Its totient is φ = 111505143499096.

The previous prime is 111561516172189. The next prime is 111561516172261. The reversal of 111561516172207 is 702271615165111.

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

It is a cyclic number.

It is not a de Polignac number, because 111561516172207 - 2²³ = 111561507783599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111561516142207) 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, 28186333588 + ... + 28186337545.

It is an arithmetic number, because the mean of its divisors is an integer number (27904472211330).

Almost surely, 2^{111561516172207} is an apocalyptic number.

111561516172207 is a deficient number, since it is larger than the sum of its proper divisors (56372673113).

111561516172207 is an equidigital number, since it uses as much as digits as its factorization.

111561516172207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56372673112.

The product of its (nonzero) digits is 176400, while the sum is 46.

The spelling of 111561516172207 in words is "one hundred eleven trillion, five hundred sixty-one billion, five hundred sixteen million, one hundred seventy-two thousand, two hundred seven".