256258777 has 2 divisors, whose sum is σ = 256258778. Its totient is φ = 256258776.

The previous prime is 256258753. The next prime is 256258813. The reversal of 256258777 is 777852652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 254115481 + 2143296 = 15941^2 + 1464^2 .

It is a cyclic number.

It is not a de Polignac number, because 256258777 - 2¹¹ = 256256729 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256258777.

It is not a weakly prime, because it can be changed into another prime (256258477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128129388 + 128129389.

It is an arithmetic number, because the mean of its divisors is an integer number (128129389).

Almost surely, 2^256258777 is an apocalyptic number.

It is an amenable number.

256258777 is a deficient number, since it is larger than the sum of its proper divisors (1).

256258777 is an equidigital number, since it uses as much as digits as its factorization.

256258777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1646400, while the sum is 49.

The square root of 256258777 is about 16008.0847386563. The cubic root of 256258777 is about 635.1742981554.

The spelling of 256258777 in words is "two hundred fifty-six million, two hundred fifty-eight thousand, seven hundred seventy-seven".