2568154649 has 2 divisors, whose sum is σ = 2568154650. Its totient is φ = 2568154648.

The previous prime is 2568154601. The next prime is 2568154751. The reversal of 2568154649 is 9464518652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2039154649 + 529000000 = 45157^2 + 23000^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2568154649 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2568154597 and 2568154606.

It is not a weakly prime, because it can be changed into another prime (2568154549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1284077324 + 1284077325.

It is an arithmetic number, because the mean of its divisors is an integer number (1284077325).

Almost surely, 2^2568154649 is an apocalyptic number.

It is an amenable number.

2568154649 is a deficient number, since it is larger than the sum of its proper divisors (1).

2568154649 is an equidigital number, since it uses as much as digits as its factorization.

2568154649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2073600, while the sum is 50.

The square root of 2568154649 is about 50676.9636916025. The cubic root of 2568154649 is about 1369.4317441889.

The spelling of 2568154649 in words is "two billion, five hundred sixty-eight million, one hundred fifty-four thousand, six hundred forty-nine".