168890561 has 8 divisors (see below), whose sum is σ = 193100160. Its totient is φ = 144701568.

The previous prime is 168890539. The next prime is 168890581. The reversal of 168890561 is 165098861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 168890561 - 2²⁶ = 101781697 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (168890581) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21905 + ... + 28593.

It is an arithmetic number, because the mean of its divisors is an integer number (24137520).

Almost surely, 2^168890561 is an apocalyptic number.

It is an amenable number.

168890561 is a deficient number, since it is larger than the sum of its proper divisors (24209599).

168890561 is an equidigital number, since it uses as much as digits as its factorization.

168890561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10303.

The product of its (nonzero) digits is 103680, while the sum is 44.

The square root of 168890561 is about 12995.7901260370. The cubic root of 168890561 is about 552.7581136676.

The spelling of 168890561 in words is "one hundred sixty-eight million, eight hundred ninety thousand, five hundred sixty-one".