268280161 has 4 divisors (see below), whose sum is σ = 269431812. Its totient is φ = 267128512.

The previous prime is 268280143. The next prime is 268280167. The reversal of 268280161 is 161082862.

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 161798400 + 106481761 = 12720^2 + 10319^2 .

It is a cyclic number.

It is not a de Polignac number, because 268280161 - 2²¹ = 266183009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (268280167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 575476 + ... + 575941.

It is an arithmetic number, because the mean of its divisors is an integer number (67357953).

Almost surely, 2^268280161 is an apocalyptic number.

It is an amenable number.

268280161 is a deficient number, since it is larger than the sum of its proper divisors (1151651).

268280161 is a wasteful number, since it uses less digits than its factorization.

268280161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1151650.

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

The square root of 268280161 is about 16379.2600870735. The cubic root of 268280161 is about 644.9551566284.

It can be divided in two parts, 2682801 and 61, that added together give a palindrome (2682862).

The spelling of 268280161 in words is "two hundred sixty-eight million, two hundred eighty thousand, one hundred sixty-one".