167859911221 has 2 divisors, whose sum is σ = 167859911222. Its totient is φ = 167859911220.

The previous prime is 167859911159. The next prime is 167859911311. The reversal of 167859911221 is 122119958761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 167804110321 + 55800900 = 409639^2 + 7470^2 .

It is a cyclic number.

It is not a de Polignac number, because 167859911221 - 2⁹ = 167859910709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (167859911321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83929955610 + 83929955611.

It is an arithmetic number, because the mean of its divisors is an integer number (83929955611).

Almost surely, 2^167859911221 is an apocalyptic number.

It is an amenable number.

167859911221 is a deficient number, since it is larger than the sum of its proper divisors (1).

167859911221 is an equidigital number, since it uses as much as digits as its factorization.

167859911221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544320, while the sum is 52.

The spelling of 167859911221 in words is "one hundred sixty-seven billion, eight hundred fifty-nine million, nine hundred eleven thousand, two hundred twenty-one".