256046746777 has 2 divisors, whose sum is σ = 256046746778. Its totient is φ = 256046746776.

The previous prime is 256046746757. The next prime is 256046746793. The reversal of 256046746777 is 777647640652.

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., 170086957056 + 85959789721 = 412416^2 + 293189^2 .

It is a cyclic number.

It is not a de Polignac number, because 256046746777 - 2⁷ = 256046746649 is a prime.

It is not a weakly prime, because it can be changed into another prime (256046746757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128023373388 + 128023373389.

It is an arithmetic number, because the mean of its divisors is an integer number (128023373389).

Almost surely, 2^256046746777 is an apocalyptic number.

It is an amenable number.

256046746777 is a deficient number, since it is larger than the sum of its proper divisors (1).

256046746777 is an equidigital number, since it uses as much as digits as its factorization.

256046746777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82978560, while the sum is 61.

The spelling of 256046746777 in words is "two hundred fifty-six billion, forty-six million, seven hundred forty-six thousand, seven hundred seventy-seven".