256859777 has 2 divisors, whose sum is σ = 256859778. Its totient is φ = 256859776.

The previous prime is 256859741. The next prime is 256859789. The reversal of 256859777 is 777958652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 245360896 + 11498881 = 15664^2 + 3391^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256859777 is a prime.

It is not a weakly prime, because it can be changed into another prime (256859717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128429888 + 128429889.

It is an arithmetic number, because the mean of its divisors is an integer number (128429889).

Almost surely, 2^256859777 is an apocalyptic number.

It is an amenable number.

256859777 is a deficient number, since it is larger than the sum of its proper divisors (1).

256859777 is an equidigital number, since it uses as much as digits as its factorization.

256859777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7408800, while the sum is 56.

The square root of 256859777 is about 16026.8455099561. The cubic root of 256859777 is about 635.6704655014.

The spelling of 256859777 in words is "two hundred fifty-six million, eight hundred fifty-nine thousand, seven hundred seventy-seven".