1218587553213 has 32 divisors (see below), whose sum is σ = 1720472749056. Its totient is φ = 765613208448.

The previous prime is 1218587553193. The next prime is 1218587553221. The reversal of 1218587553213 is 3123557858121.

It is not a de Polignac number, because 1218587553213 - 2⁵ = 1218587553181 is a prime.

It is a super-2 number, since 2×1218587553213² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218587563213) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4642306 + ... + 4897772.

It is an arithmetic number, because the mean of its divisors is an integer number (53764773408).

Almost surely, 2^{1218587553213} is an apocalyptic number.

It is an amenable number.

1218587553213 is a deficient number, since it is larger than the sum of its proper divisors (501885195843).

1218587553213 is a wasteful number, since it uses less digits than its factorization.

1218587553213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256513.

The product of its digits is 2016000, while the sum is 51.

The spelling of 1218587553213 in words is "one trillion, two hundred eighteen billion, five hundred eighty-seven million, five hundred fifty-three thousand, two hundred thirteen".