218436105887 has 4 divisors (see below), whose sum is σ = 223083682656. Its totient is φ = 213788529120.

The previous prime is 218436105751. The next prime is 218436105911. The reversal of 218436105887 is 788501634812.

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 218436105887 - 2²⁴ = 218419328671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218436105187) 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, 2323788314 + ... + 2323788407.

It is an arithmetic number, because the mean of its divisors is an integer number (55770920664).

Almost surely, 2^218436105887 is an apocalyptic number.

218436105887 is a deficient number, since it is larger than the sum of its proper divisors (4647576769).

218436105887 is an equidigital number, since it uses as much as digits as its factorization.

218436105887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4647576768.

The product of its (nonzero) digits is 2580480, while the sum is 53.

The spelling of 218436105887 in words is "two hundred eighteen billion, four hundred thirty-six million, one hundred five thousand, eight hundred eighty-seven".