111111178888961 has 2 divisors, whose sum is σ = 111111178888962. Its totient is φ = 111111178888960.

The previous prime is 111111178888889. The next prime is 111111178888979. The reversal of 111111178888961 is 169888871111111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73007027692225 + 38104151196736 = 8544415^2 + 6172856^2 .

It is an emirp because it is prime and its reverse (169888871111111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111111178888961 - 2³⁴ = 111093999019777 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111111178888894 and 111111178888903.

It is not a weakly prime, because it can be changed into another prime (111111178888861) 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 as a sum of consecutive naturals, namely, 55555589444480 + 55555589444481.

It is an arithmetic number, because the mean of its divisors is an integer number (55555589444481).

Almost surely, 2^{111111178888961} is an apocalyptic number.

It is an amenable number.

111111178888961 is a deficient number, since it is larger than the sum of its proper divisors (1).

111111178888961 is an equidigital number, since it uses as much as digits as its factorization.

111111178888961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1548288, while the sum is 62.

The spelling of 111111178888961 in words is "one hundred eleven trillion, one hundred eleven billion, one hundred seventy-eight million, eight hundred eighty-eight thousand, nine hundred sixty-one".