1264555503649 has 2 divisors, whose sum is σ = 1264555503650. Its totient is φ = 1264555503648.

The previous prime is 1264555503623. The next prime is 1264555503697. The reversal of 1264555503649 is 9463055554621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1064807291025 + 199748212624 = 1031895^2 + 446932^2 .

It is a cyclic number.

It is not a de Polignac number, because 1264555503649 - 2⁹ = 1264555503137 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1264555503649.

It is not a weakly prime, because it can be changed into another prime (1264555503619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632277751824 + 632277751825.

It is an arithmetic number, because the mean of its divisors is an integer number (632277751825).

Almost surely, 2^{1264555503649} is an apocalyptic number.

It is an amenable number.

1264555503649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1264555503649 is an equidigital number, since it uses as much as digits as its factorization.

1264555503649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440000, while the sum is 55.

The spelling of 1264555503649 in words is "one trillion, two hundred sixty-four billion, five hundred fifty-five million, five hundred three thousand, six hundred forty-nine".