255644833897 has 2 divisors, whose sum is σ = 255644833898. Its totient is φ = 255644833896.

The previous prime is 255644833849. The next prime is 255644833909. The reversal of 255644833897 is 798338446552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 177524024896 + 78120809001 = 421336^2 + 279501^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255644833897 is a prime.

It is not a weakly prime, because it can be changed into another prime (255644833097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127822416948 + 127822416949.

It is an arithmetic number, because the mean of its divisors is an integer number (127822416949).

Almost surely, 2^255644833897 is an apocalyptic number.

It is an amenable number.

255644833897 is a deficient number, since it is larger than the sum of its proper divisors (1).

255644833897 is an equidigital number, since it uses as much as digits as its factorization.

255644833897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 174182400, while the sum is 64.

The spelling of 255644833897 in words is "two hundred fifty-five billion, six hundred forty-four million, eight hundred thirty-three thousand, eight hundred ninety-seven".