218649643770 has 64 divisors (see below), whose sum is σ = 527408910720. Its totient is φ = 58012889088.

The previous prime is 218649643763. The next prime is 218649643777. The reversal of 218649643770 is 77346946812.

218649643770 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (218649643763) and next prime (218649643777).

It is a self number, because there is not a number n which added to its sum of digits gives 218649643770.

It is not an unprimeable number, because it can be changed into a prime (218649643777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4817041 + ... + 4862219.

It is an arithmetic number, because the mean of its divisors is an integer number (8240764230).

Almost surely, 2^218649643770 is an apocalyptic number.

218649643770 is an abundant number, since it is smaller than the sum of its proper divisors (308759266950).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

218649643770 is a wasteful number, since it uses less digits than its factorization.

218649643770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45999.

The product of its (nonzero) digits is 12192768, while the sum is 57.

The spelling of 218649643770 in words is "two hundred eighteen billion, six hundred forty-nine million, six hundred forty-three thousand, seven hundred seventy".