218000255521813 has 4 divisors (see below), whose sum is σ = 218009113384608. Its totient is φ = 217991397659020.

The previous prime is 218000255521771. The next prime is 218000255521921. The reversal of 218000255521813 is 318125552000812.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218000255521813 is a prime.

It is a super-2 number, since 2×218000255521813² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 218000255521813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218000255531813) 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, 4428894481 + ... + 4428943702.

It is an arithmetic number, because the mean of its divisors is an integer number (54502278346152).

Almost surely, 2^{218000255521813} is an apocalyptic number.

It is an amenable number.

218000255521813 is a deficient number, since it is larger than the sum of its proper divisors (8857862795).

218000255521813 is an equidigital number, since it uses as much as digits as its factorization.

218000255521813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8857862794.

The product of its (nonzero) digits is 192000, while the sum is 43.

The spelling of 218000255521813 in words is "two hundred eighteen trillion, two hundred fifty-five million, five hundred twenty-one thousand, eight hundred thirteen".