111111121122077 has 2 divisors, whose sum is σ = 111111121122078. Its totient is φ = 111111121122076.

The previous prime is 111111121121951. The next prime is 111111121122143. The reversal of 111111121122077 is 770221121111111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104169192481561 + 6941928640516 = 10206331^2 + 2634754^2 .

It is an emirp because it is prime and its reverse (770221121111111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111111121122077 - 2¹⁶ = 111111121056541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111111121122577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55555560561038 + 55555560561039.

It is an arithmetic number, because the mean of its divisors is an integer number (55555560561039).

Almost surely, 2^{111111121122077} is an apocalyptic number.

It is an amenable number.

111111121122077 is a deficient number, since it is larger than the sum of its proper divisors (1).

111111121122077 is an equidigital number, since it uses as much as digits as its factorization.

111111121122077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 392, while the sum is 29.

Adding to 111111121122077 its reverse (770221121111111), we get a palindrome (881332242233188).

The spelling of 111111121122077 in words is "one hundred eleven trillion, one hundred eleven billion, one hundred twenty-one million, one hundred twenty-two thousand, seventy-seven".