2018520521867 has 4 divisors (see below), whose sum is σ = 2018763228336. Its totient is φ = 2018277815400.

The previous prime is 2018520521821. The next prime is 2018520521989. The reversal of 2018520521867 is 7681250258102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2018520521867 - 2¹⁰ = 2018520520843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2018520523867) 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, 121340759 + ... + 121357392.

It is an arithmetic number, because the mean of its divisors is an integer number (504690807084).

Almost surely, 2^{2018520521867} is an apocalyptic number.

2018520521867 is a deficient number, since it is larger than the sum of its proper divisors (242706469).

2018520521867 is an equidigital number, since it uses as much as digits as its factorization.

2018520521867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242706468.

The product of its (nonzero) digits is 537600, while the sum is 47.

Adding to 2018520521867 its reverse (7681250258102), we get a palindrome (9699770779969).

The spelling of 2018520521867 in words is "two trillion, eighteen billion, five hundred twenty million, five hundred twenty-one thousand, eight hundred sixty-seven".