111945794187 has 4 divisors (see below), whose sum is σ = 149261058920. Its totient is φ = 74630529456.

The previous prime is 111945794179. The next prime is 111945794197. The reversal of 111945794187 is 781497549111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 781497549111 = 3 ⋅260499183037.

It is not a de Polignac number, because 111945794187 - 2³ = 111945794179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111945794137) 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, 18657632362 + ... + 18657632367.

It is an arithmetic number, because the mean of its divisors is an integer number (37315264730).

Almost surely, 2^111945794187 is an apocalyptic number.

111945794187 is a deficient number, since it is larger than the sum of its proper divisors (37315264733).

111945794187 is an equidigital number, since it uses as much as digits as its factorization.

111945794187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37315264732.

The product of its digits is 2540160, while the sum is 57.

The spelling of 111945794187 in words is "one hundred eleven billion, nine hundred forty-five million, seven hundred ninety-four thousand, one hundred eighty-seven".