111782213138 has 18 divisors (see below), whose sum is σ = 170605985511. Its totient is φ = 54930087724.

The previous prime is 111782213111. The next prime is 111782213143. The reversal of 111782213138 is 831312287111.

It is a happy number.

111782213138 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 55891106569 + 55891106569 = 236413^2 + 236413^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=236413.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 27894731 + ... + 27898737.

Almost surely, 2^111782213138 is an apocalyptic number.

111782213138 is a deficient number, since it is larger than the sum of its proper divisors (58823772373).

111782213138 is an frugal number, since it uses more digits than its factorization.

111782213138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8134 (or 4068 counting only the distinct ones).

The product of its digits is 16128, while the sum is 38.

The spelling of 111782213138 in words is "one hundred eleven billion, seven hundred eighty-two million, two hundred thirteen thousand, one hundred thirty-eight".