168420073 has 2 divisors, whose sum is σ = 168420074. Its totient is φ = 168420072.

The previous prime is 168420029. The next prime is 168420079. The reversal of 168420073 is 370024861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166100544 + 2319529 = 12888^2 + 1523^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168420073 is a prime.

It is not a weakly prime, because it can be changed into another prime (168420079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84210036 + 84210037.

It is an arithmetic number, because the mean of its divisors is an integer number (84210037).

Almost surely, 2^168420073 is an apocalyptic number.

It is an amenable number.

168420073 is a deficient number, since it is larger than the sum of its proper divisors (1).

168420073 is an equidigital number, since it uses as much as digits as its factorization.

168420073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 168420073 is about 12977.6759475647. The cubic root of 168420073 is about 552.2443531080.

The spelling of 168420073 in words is "one hundred sixty-eight million, four hundred twenty thousand, seventy-three".