111511715161 has 12 divisors (see below), whose sum is σ = 141510229200. Its totient is φ = 86892245160.

The previous prime is 111511715123. The next prime is 111511715173. The reversal of 111511715161 is 161517115111.

It is not a de Polignac number, because 111511715161 - 2⁹ = 111511714649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111511715191) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 103442611 + ... + 103443688.

It is an arithmetic number, because the mean of its divisors is an integer number (11792519100).

Almost surely, 2^111511715161 is an apocalyptic number.

111511715161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111511715161 is a deficient number, since it is larger than the sum of its proper divisors (29998514039).

111511715161 is a wasteful number, since it uses less digits than its factorization.

111511715161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206886324 (or 206886317 counting only the distinct ones).

The product of its digits is 1050, while the sum is 31.

The spelling of 111511715161 in words is "one hundred eleven billion, five hundred eleven million, seven hundred fifteen thousand, one hundred sixty-one".