1255564604449 has 2 divisors, whose sum is σ = 1255564604450. Its totient is φ = 1255564604448.

The previous prime is 1255564604401. The next prime is 1255564604471. The reversal of 1255564604449 is 9444064655521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 911385262225 + 344179342224 = 954665^2 + 586668^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1255564604449 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1255564604449.

It is not a weakly prime, because it can be changed into another prime (1255564604479) 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, 627782302224 + 627782302225.

It is an arithmetic number, because the mean of its divisors is an integer number (627782302225).

Almost surely, 2^{1255564604449} is an apocalyptic number.

It is an amenable number.

1255564604449 is a deficient number, since it is larger than the sum of its proper divisors (1).

1255564604449 is an equidigital number, since it uses as much as digits as its factorization.

1255564604449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736000, while the sum is 55.

The spelling of 1255564604449 in words is "one trillion, two hundred fifty-five billion, five hundred sixty-four million, six hundred four thousand, four hundred forty-nine".