111666222469 has 2 divisors, whose sum is σ = 111666222470. Its totient is φ = 111666222468.

The previous prime is 111666222413. The next prime is 111666222511. The reversal of 111666222469 is 964222666111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67948848900 + 43717373569 = 260670^2 + 209087^2 .

It is an emirp because it is prime and its reverse (964222666111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111666222469 - 2¹⁹ = 111665698181 is a prime.

It is a super-2 number, since 2×111666222469² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111666228469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55833111234 + 55833111235.

It is an arithmetic number, because the mean of its divisors is an integer number (55833111235).

Almost surely, 2^111666222469 is an apocalyptic number.

It is an amenable number.

111666222469 is a deficient number, since it is larger than the sum of its proper divisors (1).

111666222469 is an equidigital number, since it uses as much as digits as its factorization.

111666222469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 373248, while the sum is 46.

The spelling of 111666222469 in words is "one hundred eleven billion, six hundred sixty-six million, two hundred twenty-two thousand, four hundred sixty-nine".