111223166665571 has 2 divisors, whose sum is σ = 111223166665572. Its totient is φ = 111223166665570.

The previous prime is 111223166665543. The next prime is 111223166665579. The reversal of 111223166665571 is 175566661322111.

It is a strong prime.

It is an emirp because it is prime and its reverse (175566661322111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111223166665571 - 2³⁸ = 110948288758627 is a prime.

It is not a weakly prime, because it can be changed into another prime (111223166665579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55611583332785 + 55611583332786.

It is an arithmetic number, because the mean of its divisors is an integer number (55611583332786).

Almost surely, 2^{111223166665571} is an apocalyptic number.

111223166665571 is a deficient number, since it is larger than the sum of its proper divisors (1).

111223166665571 is an equidigital number, since it uses as much as digits as its factorization.

111223166665571 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2721600, while the sum is 53.

The spelling of 111223166665571 in words is "one hundred eleven trillion, two hundred twenty-three billion, one hundred sixty-six million, six hundred sixty-five thousand, five hundred seventy-one".