1218317516813 has 16 divisors (see below), whose sum is σ = 1229241753600. Its totient is φ = 1207453801536.

The previous prime is 1218317516797. The next prime is 1218317516821. The reversal of 1218317516813 is 3186157138121.

It is a cyclic number.

It is not a de Polignac number, because 1218317516813 - 2⁴ = 1218317516797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218317516513) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48551156 + ... + 48576242.

It is an arithmetic number, because the mean of its divisors is an integer number (76827609600).

Almost surely, 2^{1218317516813} is an apocalyptic number.

It is an amenable number.

1218317516813 is a deficient number, since it is larger than the sum of its proper divisors (10924236787).

1218317516813 is a wasteful number, since it uses less digits than its factorization.

1218317516813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26276.

The product of its digits is 241920, while the sum is 47.

The spelling of 1218317516813 in words is "one trillion, two hundred eighteen billion, three hundred seventeen million, five hundred sixteen thousand, eight hundred thirteen".