2578765489 has 2 divisors, whose sum is σ = 2578765490. Its totient is φ = 2578765488.

The previous prime is 2578765457. The next prime is 2578765529. The reversal of 2578765489 is 9845678752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1560645025 + 1018120464 = 39505^2 + 31908^2 .

It is a cyclic number.

It is not a de Polignac number, because 2578765489 - 2⁵ = 2578765457 is a prime.

It is not a weakly prime, because it can be changed into another prime (2578760489) 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 as a sum of consecutive naturals, namely, 1289382744 + 1289382745.

It is an arithmetic number, because the mean of its divisors is an integer number (1289382745).

Almost surely, 2^2578765489 is an apocalyptic number.

It is an amenable number.

2578765489 is a deficient number, since it is larger than the sum of its proper divisors (1).

2578765489 is an equidigital number, since it uses as much as digits as its factorization.

2578765489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 33868800, while the sum is 61.

The square root of 2578765489 is about 50781.5467369792. The cubic root of 2578765489 is about 1371.3151788724.

The spelling of 2578765489 in words is "two billion, five hundred seventy-eight million, seven hundred sixty-five thousand, four hundred eighty-nine".