218787100189 has 24 divisors (see below), whose sum is σ = 255465595008. Its totient is φ = 186826479840.

The previous prime is 218787100177. The next prime is 218787100193. The reversal of 218787100189 is 981001787812.

It is a de Polignac number, because none of the positive numbers 2^k-218787100189 is a prime.

It is a super-2 number, since 2×218787100189² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218787100139) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43992507 + ... + 43997479.

It is an arithmetic number, because the mean of its divisors is an integer number (10644399792).

Almost surely, 2^218787100189 is an apocalyptic number.

It is an amenable number.

218787100189 is a deficient number, since it is larger than the sum of its proper divisors (36678494819).

218787100189 is a wasteful number, since it uses less digits than its factorization.

218787100189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8185 (or 8178 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 52.

The spelling of 218787100189 in words is "two hundred eighteen billion, seven hundred eighty-seven million, one hundred thousand, one hundred eighty-nine".