268820161 has 4 divisors (see below), whose sum is σ = 268998192. Its totient is φ = 268642132.

The previous prime is 268820141. The next prime is 268820171. The reversal of 268820161 is 161028862.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 268820161 - 2²⁵ = 235265729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (268820131) 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, 86731 + ... + 89776.

It is an arithmetic number, because the mean of its divisors is an integer number (67249548).

Almost surely, 2^268820161 is an apocalyptic number.

It is an amenable number.

268820161 is a deficient number, since it is larger than the sum of its proper divisors (178031).

268820161 is a wasteful number, since it uses less digits than its factorization.

268820161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178030.

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 268820161 is about 16395.7360615497. The cubic root of 268820161 is about 645.3875930932.

The spelling of 268820161 in words is "two hundred sixty-eight million, eight hundred twenty thousand, one hundred sixty-one".