255776777 has 2 divisors, whose sum is σ = 255776778. Its totient is φ = 255776776.

The previous prime is 255776761. The next prime is 255776779. The reversal of 255776777 is 777677552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 222725776 + 33051001 = 14924^2 + 5749^2 .

It is a cyclic number.

It is not a de Polignac number, because 255776777 - 2⁴ = 255776761 is a prime.

Together with 255776779, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (255776779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127888388 + 127888389.

It is an arithmetic number, because the mean of its divisors is an integer number (127888389).

Almost surely, 2^255776777 is an apocalyptic number.

It is an amenable number.

255776777 is a deficient number, since it is larger than the sum of its proper divisors (1).

255776777 is an equidigital number, since it uses as much as digits as its factorization.

255776777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5042100, while the sum is 53.

The square root of 255776777 is about 15993.0227599413. The cubic root of 255776777 is about 634.7758127316.

The spelling of 255776777 in words is "two hundred fifty-five million, seven hundred seventy-six thousand, seven hundred seventy-seven".