255801128857 has 2 divisors, whose sum is σ = 255801128858. Its totient is φ = 255801128856.

The previous prime is 255801128839. The next prime is 255801128873. The reversal of 255801128857 is 758821108552.

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., 197785662361 + 58015466496 = 444731^2 + 240864^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255801128857 is a prime.

It is not a weakly prime, because it can be changed into another prime (255801123857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127900564428 + 127900564429.

It is an arithmetic number, because the mean of its divisors is an integer number (127900564429).

Almost surely, 2^255801128857 is an apocalyptic number.

It is an amenable number.

255801128857 is a deficient number, since it is larger than the sum of its proper divisors (1).

255801128857 is an equidigital number, since it uses as much as digits as its factorization.

255801128857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1792000, while the sum is 52.

The spelling of 255801128857 in words is "two hundred fifty-five billion, eight hundred one million, one hundred twenty-eight thousand, eight hundred fifty-seven".