1255851506857 has 2 divisors, whose sum is σ = 1255851506858. Its totient is φ = 1255851506856.

The previous prime is 1255851506849. The next prime is 1255851506863. The reversal of 1255851506857 is 7586051585521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1186838115241 + 69013391616 = 1089421^2 + 262704^2 .

It is a cyclic number.

It is not a de Polignac number, because 1255851506857 - 2³ = 1255851506849 is a prime.

It is not a weakly prime, because it can be changed into another prime (1255851506257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 627925753428 + 627925753429.

It is an arithmetic number, because the mean of its divisors is an integer number (627925753429).

Almost surely, 2^{1255851506857} is an apocalyptic number.

It is an amenable number.

1255851506857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1255851506857 is an equidigital number, since it uses as much as digits as its factorization.

1255851506857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16800000, while the sum is 58.

The spelling of 1255851506857 in words is "one trillion, two hundred fifty-five billion, eight hundred fifty-one million, five hundred six thousand, eight hundred fifty-seven".