111355824978 has 16 divisors (see below), whose sum is σ = 247457388960. Its totient is φ = 37118608308.

The previous prime is 111355824973. The next prime is 111355824989. The reversal of 111355824978 is 879428553111.

111355824978 is a `hidden beast` number, since 1 + 1 + 13 + 5 + 582 + 49 + 7 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 2062144907 = 111355824978 / (1 + 1 + 1 + 3 + 5 + 5 + 8 + 2 + 4 + 9 + 7 + 8).

It is not an unprimeable number, because it can be changed into a prime (111355824973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1031072400 + ... + 1031072507.

It is an arithmetic number, because the mean of its divisors is an integer number (15466086810).

Almost surely, 2^111355824978 is an apocalyptic number.

111355824978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

111355824978 is an abundant number, since it is smaller than the sum of its proper divisors (136101563982).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

111355824978 is a wasteful number, since it uses less digits than its factorization.

111355824978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2062144918 (or 2062144912 counting only the distinct ones).

The product of its digits is 2419200, while the sum is 54.

The spelling of 111355824978 in words is "one hundred eleven billion, three hundred fifty-five million, eight hundred twenty-four thousand, nine hundred seventy-eight".