167021718889 has 2 divisors, whose sum is σ = 167021718890. Its totient is φ = 167021718888.

The previous prime is 167021718887. The next prime is 167021718923. The reversal of 167021718889 is 988817120761.

167021718889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 162409000000 + 4612718889 = 403000^2 + 67917^2 .

It is a cyclic number.

It is not a de Polignac number, because 167021718889 - 2¹ = 167021718887 is a prime.

It is a super-2 number, since 2×167021718889² (a number of 23 digits) contains 22 as substring.

Together with 167021718887, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (167021718887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83510859444 + 83510859445.

It is an arithmetic number, because the mean of its divisors is an integer number (83510859445).

Almost surely, 2^167021718889 is an apocalyptic number.

It is an amenable number.

167021718889 is a deficient number, since it is larger than the sum of its proper divisors (1).

167021718889 is an equidigital number, since it uses as much as digits as its factorization.

167021718889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2709504, while the sum is 58.

The spelling of 167021718889 in words is "one hundred sixty-seven billion, twenty-one million, seven hundred eighteen thousand, eight hundred eighty-nine".