111621670169 has 2 divisors, whose sum is σ = 111621670170. Its totient is φ = 111621670168.

The previous prime is 111621670087. The next prime is 111621670187. The reversal of 111621670169 is 961076126111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102480015625 + 9141654544 = 320125^2 + 95612^2 .

It is a cyclic number.

It is not a de Polignac number, because 111621670169 - 2²⁴ = 111604892953 is a prime.

It is a super-2 number, since 2×111621670169² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (111621670669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55810835084 + 55810835085.

It is an arithmetic number, because the mean of its divisors is an integer number (55810835085).

Almost surely, 2^111621670169 is an apocalyptic number.

It is an amenable number.

111621670169 is a deficient number, since it is larger than the sum of its proper divisors (1).

111621670169 is an equidigital number, since it uses as much as digits as its factorization.

111621670169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 41.

The spelling of 111621670169 in words is "one hundred eleven billion, six hundred twenty-one million, six hundred seventy thousand, one hundred sixty-nine".