2578765457 has 2 divisors, whose sum is σ = 2578765458. Its totient is φ = 2578765456.

The previous prime is 2578765421. The next prime is 2578765489. The reversal of 2578765457 is 7545678752.

2578765457 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2019963136 + 558802321 = 44944^2 + 23639^2 .

It is a cyclic number.

It is not a de Polignac number, because 2578765457 - 2¹⁴ = 2578749073 is a prime.

It is not a weakly prime, because it can be changed into another prime (2578762457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1289382728 + 1289382729.

It is an arithmetic number, because the mean of its divisors is an integer number (1289382729).

Almost surely, 2^2578765457 is an apocalyptic number.

It is an amenable number.

2578765457 is a deficient number, since it is larger than the sum of its proper divisors (1).

2578765457 is an equidigital number, since it uses as much as digits as its factorization.

2578765457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16464000, while the sum is 56.

The square root of 2578765457 is about 50781.5464219041. The cubic root of 2578765457 is about 1371.3151732002.

The spelling of 2578765457 in words is "two billion, five hundred seventy-eight million, seven hundred sixty-five thousand, four hundred fifty-seven".