111117188977 has 2 divisors, whose sum is σ = 111117188978. Its totient is φ = 111117188976.

The previous prime is 111117188909. The next prime is 111117188993. The reversal of 111117188977 is 779881711111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81615347856 + 29501841121 = 285684^2 + 171761^2 .

It is an emirp because it is prime and its reverse (779881711111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111117188977 - 2¹⁹ = 111116664689 is a prime.

It is not a weakly prime, because it can be changed into another prime (111117183977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55558594488 + 55558594489.

It is an arithmetic number, because the mean of its divisors is an integer number (55558594489).

Almost surely, 2^111117188977 is an apocalyptic number.

It is an amenable number.

111117188977 is a deficient number, since it is larger than the sum of its proper divisors (1).

111117188977 is an equidigital number, since it uses as much as digits as its factorization.

111117188977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 197568, while the sum is 52.

The spelling of 111117188977 in words is "one hundred eleven billion, one hundred seventeen million, one hundred eighty-eight thousand, nine hundred seventy-seven".