111111178888849 has 2 divisors, whose sum is σ = 111111178888850. Its totient is φ = 111111178888848.

The previous prime is 111111178888847. The next prime is 111111178888861. The reversal of 111111178888849 is 948888871111111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89956404166225 + 21154774722624 = 9484535^2 + 4599432^2 .

It is a cyclic number.

It is not a de Polignac number, because 111111178888849 - 2¹ = 111111178888847 is a prime.

Together with 111111178888847, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (111111178888841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55555589444424 + 55555589444425.

It is an arithmetic number, because the mean of its divisors is an integer number (55555589444425).

Almost surely, 2^{111111178888849} is an apocalyptic number.

It is an amenable number.

111111178888849 is a deficient number, since it is larger than the sum of its proper divisors (1).

111111178888849 is an equidigital number, since it uses as much as digits as its factorization.

111111178888849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8257536, while the sum is 67.

The spelling of 111111178888849 in words is "one hundred eleven trillion, one hundred eleven billion, one hundred seventy-eight million, eight hundred eighty-eight thousand, eight hundred forty-nine".