1255805620651 has 2 divisors, whose sum is σ = 1255805620652. Its totient is φ = 1255805620650.

The previous prime is 1255805620561. The next prime is 1255805620681. The reversal of 1255805620651 is 1560265085521.

Together with previous prime (1255805620561) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1255805620651 - 2¹¹ = 1255805618603 is a prime.

It is not a weakly prime, because it can be changed into another prime (1255805620681) 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, 627902810325 + 627902810326.

It is an arithmetic number, because the mean of its divisors is an integer number (627902810326).

Almost surely, 2^{1255805620651} is an apocalyptic number.

1255805620651 is a deficient number, since it is larger than the sum of its proper divisors (1).

1255805620651 is an equidigital number, since it uses as much as digits as its factorization.

1255805620651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720000, while the sum is 46.

The spelling of 1255805620651 in words is "one trillion, two hundred fifty-five billion, eight hundred five million, six hundred twenty thousand, six hundred fifty-one".