168445553 has 2 divisors, whose sum is σ = 168445554. Its totient is φ = 168445552.

The previous prime is 168445549. The next prime is 168445559. The reversal of 168445553 is 355544861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116143729 + 52301824 = 10777^2 + 7232^2 .

It is a cyclic number.

It is not a de Polignac number, because 168445553 - 2² = 168445549 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 168445553.

It is not a weakly prime, because it can be changed into another prime (168445559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84222776 + 84222777.

It is an arithmetic number, because the mean of its divisors is an integer number (84222777).

Almost surely, 2^168445553 is an apocalyptic number.

It is an amenable number.

168445553 is a deficient number, since it is larger than the sum of its proper divisors (1).

168445553 is an equidigital number, since it uses as much as digits as its factorization.

168445553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288000, while the sum is 41.

The square root of 168445553 is about 12978.6575962231. The cubic root of 168445553 is about 552.2722010882.

The spelling of 168445553 in words is "one hundred sixty-eight million, four hundred forty-five thousand, five hundred fifty-three".