2568161321 has 16 divisors (see below), whose sum is σ = 3038793408. Its totient is φ = 2143756800.

The previous prime is 2568161293. The next prime is 2568161327. The reversal of 2568161321 is 1231618652.

It is a cyclic number.

It is not a de Polignac number, because 2568161321 - 2¹⁰ = 2568160297 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 (2568161327) 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 in 15 ways as a sum of consecutive naturals, for example, 159815 + ... + 175148.

It is an arithmetic number, because the mean of its divisors is an integer number (189924588).

Almost surely, 2^2568161321 is an apocalyptic number.

It is an amenable number.

2568161321 is a deficient number, since it is larger than the sum of its proper divisors (470632087).

2568161321 is a wasteful number, since it uses less digits than its factorization.

2568161321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335032.

The product of its digits is 17280, while the sum is 35.

The square root of 2568161321 is about 50677.0295202866. The cubic root of 2568161321 is about 1369.4329301040.

Adding to 2568161321 its reverse (1231618652), we get a palindrome (3799779973).

The spelling of 2568161321 in words is "two billion, five hundred sixty-eight million, one hundred sixty-one thousand, three hundred twenty-one".