111111178888899 has 128 divisors (see below), whose sum is σ = 203838976788480. Its totient is φ = 58363066847232.

The previous prime is 111111178888889. The next prime is 111111178888961. The reversal of 111111178888899 is 998888871111111.

It is not a de Polignac number, because 111111178888899 - 2⁴ = 111111178888883 is a prime.

It is a hoax number, since the sum of its digits (72) coincides with the sum of the digits of its distinct prime factors.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (111111178888849) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2549978877 + ... + 2550022449.

It is an arithmetic number, because the mean of its divisors is an integer number (1592492006160).

Almost surely, 2^{111111178888899} is an apocalyptic number.

111111178888899 is the 6666669-th heptagonal number.

111111178888899 is a deficient number, since it is larger than the sum of its proper divisors (92727797899581).

111111178888899 is a wasteful number, since it uses less digits than its factorization.

111111178888899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62106 (or 62100 counting only the distinct ones).

The product of its digits is 18579456, while the sum is 72.

The spelling of 111111178888899 in words is "one hundred eleven trillion, one hundred eleven billion, one hundred seventy-eight million, eight hundred eighty-eight thousand, eight hundred ninety-nine".