168446561 has 4 divisors (see below), whose sum is σ = 171624852. Its totient is φ = 165268272.

The previous prime is 168446527. The next prime is 168446563. The reversal of 168446561 is 165644861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 98406400 + 70040161 = 9920^2 + 8369^2 .

It is a cyclic number.

It is not a de Polignac number, because 168446561 - 2⁶ = 168446497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168446563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1589066 + ... + 1589171.

It is an arithmetic number, because the mean of its divisors is an integer number (42906213).

Almost surely, 2^168446561 is an apocalyptic number.

It is an amenable number.

168446561 is a deficient number, since it is larger than the sum of its proper divisors (3178291).

168446561 is an equidigital number, since it uses as much as digits as its factorization.

168446561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3178290.

The product of its digits is 138240, while the sum is 41.

The square root of 168446561 is about 12978.6964291488. The cubic root of 168446561 is about 552.2733027088.

The spelling of 168446561 in words is "one hundred sixty-eight million, four hundred forty-six thousand, five hundred sixty-one".