256559777 has 2 divisors, whose sum is σ = 256559778. Its totient is φ = 256559776.

The previous prime is 256559773. The next prime is 256559783. The reversal of 256559777 is 777955652.

256559777 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 252682816 + 3876961 = 15896^2 + 1969^2 .

It is a cyclic number.

It is not a de Polignac number, because 256559777 - 2² = 256559773 is a prime.

It is not a weakly prime, because it can be changed into another prime (256559773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128279888 + 128279889.

It is an arithmetic number, because the mean of its divisors is an integer number (128279889).

Almost surely, 2^256559777 is an apocalyptic number.

It is an amenable number.

256559777 is a deficient number, since it is larger than the sum of its proper divisors (1).

256559777 is an equidigital number, since it uses as much as digits as its factorization.

256559777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4630500, while the sum is 53.

The square root of 256559777 is about 16017.4834789988. The cubic root of 256559777 is about 635.4228914704.

The spelling of 256559777 in words is "two hundred fifty-six million, five hundred fifty-nine thousand, seven hundred seventy-seven".