218857261819 has 6 divisors (see below), whose sum is σ = 254589059724. Its totient is φ = 187591938660.

The previous prime is 218857261813. The next prime is 218857261867. The reversal of 218857261819 is 918162758812.

It is not a de Polignac number, because 218857261819 - 2⁵ = 218857261787 is a prime.

It is a super-2 number, since 2×218857261819² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218857261813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2233237317 + ... + 2233237414.

It is an arithmetic number, because the mean of its divisors is an integer number (42431509954).

Almost surely, 2^218857261819 is an apocalyptic number.

218857261819 is a deficient number, since it is larger than the sum of its proper divisors (35731797905).

218857261819 is an equidigital number, since it uses as much as digits as its factorization.

218857261819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4466474745 (or 4466474738 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 58.

The spelling of 218857261819 in words is "two hundred eighteen billion, eight hundred fifty-seven million, two hundred sixty-one thousand, eight hundred nineteen".