255777811 has 2 divisors, whose sum is σ = 255777812. Its totient is φ = 255777810.

The previous prime is 255777761. The next prime is 255777817. The reversal of 255777811 is 118777552.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 255777811 - 2¹¹ = 255775763 is a prime.

It is not a weakly prime, because it can be changed into another prime (255777817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127888905 + 127888906.

It is an arithmetic number, because the mean of its divisors is an integer number (127888906).

Almost surely, 2^255777811 is an apocalyptic number.

255777811 is a deficient number, since it is larger than the sum of its proper divisors (1).

255777811 is an equidigital number, since it uses as much as digits as its factorization.

255777811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 137200, while the sum is 43.

The square root of 255777811 is about 15993.0550865055. The cubic root of 255777811 is about 634.7766681094.

The spelling of 255777811 in words is "two hundred fifty-five million, seven hundred seventy-seven thousand, eight hundred eleven".