111181900161 has 16 divisors (see below), whose sum is σ = 151597152320. Its totient is φ = 72458867520.

The previous prime is 111181900097. The next prime is 111181900169. The reversal of 111181900161 is 161009181111.

It is a happy number.

It is not a de Polignac number, because 111181900161 - 2⁶ = 111181900097 is a prime.

It is a super-2 number, since 2×111181900161² (a number of 23 digits) contains 22 as substring.

It is the 333440-th Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111181900169) by changing a digit.

It is a nontrivial repunit in base 333439.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1833826 + ... + 1893483.

It is an arithmetic number, because the mean of its divisors is an integer number (9474822020).

Almost surely, 2^111181900161 is an apocalyptic number.

It is an amenable number.

111181900161 is a deficient number, since it is larger than the sum of its proper divisors (40415252159).

111181900161 is a wasteful number, since it uses less digits than its factorization.

111181900161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3727536.

The product of its (nonzero) digits is 432, while the sum is 30.

The spelling of 111181900161 in words is "one hundred eleven billion, one hundred eighty-one million, nine hundred thousand, one hundred sixty-one".