167428558021 has 2 divisors, whose sum is σ = 167428558022. Its totient is φ = 167428558020.

The previous prime is 167428558007. The next prime is 167428558027. The reversal of 167428558021 is 120855824761.

167428558021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155653920900 + 11774637121 = 394530^2 + 108511^2 .

It is a cyclic number.

It is not a de Polignac number, because 167428558021 - 2¹⁹ = 167428033733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (167428558027) 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, 83714279010 + 83714279011.

It is an arithmetic number, because the mean of its divisors is an integer number (83714279011).

Almost surely, 2^167428558021 is an apocalyptic number.

It is an amenable number.

167428558021 is a deficient number, since it is larger than the sum of its proper divisors (1).

167428558021 is an equidigital number, since it uses as much as digits as its factorization.

167428558021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1075200, while the sum is 49.

The spelling of 167428558021 in words is "one hundred sixty-seven billion, four hundred twenty-eight million, five hundred fifty-eight thousand, twenty-one".