1311263645506 has 8 divisors (see below), whose sum is σ = 2082595201740. Its totient is φ = 617065244928.

The previous prime is 1311263645477. The next prime is 1311263645507. The reversal of 1311263645506 is 6055463621131.

It can be written as a sum of positive squares in 2 ways, for example, as 1222331459281 + 88932186225 = 1105591^2 + 298215^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1311263645507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19283288871 + ... + 19283288938.

Almost surely, 2^{1311263645506} is an apocalyptic number.

1311263645506 is a deficient number, since it is larger than the sum of its proper divisors (771331556234).

1311263645506 is a wasteful number, since it uses less digits than its factorization.

1311263645506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38566577828.

The product of its (nonzero) digits is 388800, while the sum is 43.

The spelling of 1311263645506 in words is "one trillion, three hundred eleven billion, two hundred sixty-three million, six hundred forty-five thousand, five hundred six".