218937053891 has 4 divisors (see below), whose sum is σ = 222526185984. Its totient is φ = 215347921800.

The previous prime is 218937053869. The next prime is 218937053897. The reversal of 218937053891 is 198350739812.

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

It is not a de Polignac number, because 218937053891 - 2¹⁴ = 218937037507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218937053897) 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, 1794565955 + ... + 1794566076.

It is an arithmetic number, because the mean of its divisors is an integer number (55631546496).

Almost surely, 2^218937053891 is an apocalyptic number.

218937053891 is a deficient number, since it is larger than the sum of its proper divisors (3589132093).

218937053891 is an equidigital number, since it uses as much as digits as its factorization.

218937053891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3589132092.

The product of its (nonzero) digits is 3265920, while the sum is 56.

The spelling of 218937053891 in words is "two hundred eighteen billion, nine hundred thirty-seven million, fifty-three thousand, eight hundred ninety-one".