111111099999797 has 2 divisors, whose sum is σ = 111111099999798. Its totient is φ = 111111099999796.

The previous prime is 111111099999791. The next prime is 111111099999839. The reversal of 111111099999797 is 797999990111111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84840052469956 + 26271047529841 = 9210866^2 + 5125529^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111111099999797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111111099999791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55555549999898 + 55555549999899.

It is an arithmetic number, because the mean of its divisors is an integer number (55555549999899).

Almost surely, 2^{111111099999797} is an apocalyptic number.

It is an amenable number.

111111099999797 is a deficient number, since it is larger than the sum of its proper divisors (1).

111111099999797 is an equidigital number, since it uses as much as digits as its factorization.

111111099999797 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26040609, while the sum is 74.

The spelling of 111111099999797 in words is "one hundred eleven trillion, one hundred eleven billion, ninety-nine million, nine hundred ninety-nine thousand, seven hundred ninety-seven".