2540078257 has 2 divisors, whose sum is σ = 2540078258. Its totient is φ = 2540078256.

The previous prime is 2540078227. The next prime is 2540078263. The reversal of 2540078257 is 7528700452.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1778814976 + 761263281 = 42176^2 + 27591^2 .

It is a cyclic number.

It is not a de Polignac number, because 2540078257 - 2¹⁹ = 2539553969 is a prime.

It is not a weakly prime, because it can be changed into another prime (2540078227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1270039128 + 1270039129.

It is an arithmetic number, because the mean of its divisors is an integer number (1270039129).

Almost surely, 2^2540078257 is an apocalyptic number.

It is an amenable number.

2540078257 is a deficient number, since it is larger than the sum of its proper divisors (1).

2540078257 is an equidigital number, since it uses as much as digits as its factorization.

2540078257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 156800, while the sum is 40.

The square root of 2540078257 is about 50399.1890510155. The cubic root of 2540078257 is about 1364.4230020274.

The spelling of 2540078257 in words is "two billion, five hundred forty million, seventy-eight thousand, two hundred fifty-seven".