111111111209977 has 2 divisors, whose sum is σ = 111111111209978. Its totient is φ = 111111111209976.

The previous prime is 111111111209899. The next prime is 111111111210007. The reversal of 111111111209977 is 779902111111111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101992951912336 + 9118159297641 = 10099156^2 + 3019629^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111111111209977 is a prime.

It is not a weakly prime, because it can be changed into another prime (111111111309977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55555555604988 + 55555555604989.

It is an arithmetic number, because the mean of its divisors is an integer number (55555555604989).

Almost surely, 2^{111111111209977} is an apocalyptic number.

It is an amenable number.

111111111209977 is a deficient number, since it is larger than the sum of its proper divisors (1).

111111111209977 is an equidigital number, since it uses as much as digits as its factorization.

111111111209977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7938, while the sum is 43.

The spelling of 111111111209977 in words is "one hundred eleven trillion, one hundred eleven billion, one hundred eleven million, two hundred nine thousand, nine hundred seventy-seven".