256205077 has 2 divisors, whose sum is σ = 256205078. Its totient is φ = 256205076.

The previous prime is 256205041. The next prime is 256205087. The reversal of 256205077 is 770502652.

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., 135512881 + 120692196 = 11641^2 + 10986^2 .

It is a cyclic number.

It is not a de Polignac number, because 256205077 - 2¹¹ = 256203029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256205087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128102538 + 128102539.

It is an arithmetic number, because the mean of its divisors is an integer number (128102539).

Almost surely, 2^256205077 is an apocalyptic number.

It is an amenable number.

256205077 is a deficient number, since it is larger than the sum of its proper divisors (1).

256205077 is an equidigital number, since it uses as much as digits as its factorization.

256205077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29400, while the sum is 34.

The square root of 256205077 is about 16006.4073732990. The cubic root of 256205077 is about 635.1299273270.

The spelling of 256205077 in words is "two hundred fifty-six million, two hundred five thousand, seventy-seven".