1255805751709 has 2 divisors, whose sum is σ = 1255805751710. Its totient is φ = 1255805751708.

The previous prime is 1255805751647. The next prime is 1255805751727. The reversal of 1255805751709 is 9071575085521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1251154102500 + 4651649209 = 1118550^2 + 68203^2 .

It is a cyclic number.

It is not a de Polignac number, because 1255805751709 - 2⁷ = 1255805751581 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1255805751709.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1255805751749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 627902875854 + 627902875855.

It is an arithmetic number, because the mean of its divisors is an integer number (627902875855).

Almost surely, 2^{1255805751709} is an apocalyptic number.

It is an amenable number.

1255805751709 is a deficient number, since it is larger than the sum of its proper divisors (1).

1255805751709 is an equidigital number, since it uses as much as digits as its factorization.

1255805751709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4410000, while the sum is 55.

The spelling of 1255805751709 in words is "one trillion, two hundred fifty-five billion, eight hundred five million, seven hundred fifty-one thousand, seven hundred nine".