111643075861 has 2 divisors, whose sum is σ = 111643075862. Its totient is φ = 111643075860.

The previous prime is 111643075847. The next prime is 111643075877. The reversal of 111643075861 is 168570346111.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85442797636 + 26200278225 = 292306^2 + 161865^2 .

It is an emirp because it is prime and its reverse (168570346111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111643075861 - 2⁵ = 111643075829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111643075811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55821537930 + 55821537931.

It is an arithmetic number, because the mean of its divisors is an integer number (55821537931).

Almost surely, 2^111643075861 is an apocalyptic number.

It is an amenable number.

111643075861 is a deficient number, since it is larger than the sum of its proper divisors (1).

111643075861 is an equidigital number, since it uses as much as digits as its factorization.

111643075861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 43.

The spelling of 111643075861 in words is "one hundred eleven billion, six hundred forty-three million, seventy-five thousand, eight hundred sixty-one".