2568639145 has 8 divisors (see below), whose sum is σ = 3082640904. Its totient is φ = 2054728704.

The previous prime is 2568639133. The next prime is 2568639169. The reversal of 2568639145 is 5419368652.

It can be written as a sum of positive squares in 4 ways, for example, as 502118464 + 2066520681 = 22408^2 + 45459^2 .

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 2568639145 - 2⁵ = 2568639113 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87817 + ... + 113353.

It is an arithmetic number, because the mean of its divisors is an integer number (385330113).

Almost surely, 2^2568639145 is an apocalyptic number.

It is an amenable number.

2568639145 is a deficient number, since it is larger than the sum of its proper divisors (514001759).

2568639145 is a wasteful number, since it uses less digits than its factorization.

2568639145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45659.

The product of its digits is 1555200, while the sum is 49.

The square root of 2568639145 is about 50681.7437052041. The cubic root of 2568639145 is about 1369.5178556287.

The spelling of 2568639145 in words is "two billion, five hundred sixty-eight million, six hundred thirty-nine thousand, one hundred forty-five".