218722169408 has 28 divisors (see below), whose sum is σ = 445757263932. Its totient is φ = 106405378560.

The previous prime is 218722169389. The next prime is 218722169437. The reversal of 218722169408 is 804961227812.

218722169408 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 155040637504 + 63681531904 = 393752^2 + 252352^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 46180523 + ... + 46185258.

Almost surely, 2^218722169408 is an apocalyptic number.

It is an amenable number.

218722169408 is an abundant number, since it is smaller than the sum of its proper divisors (227035094524).

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

218722169408 is an equidigital number, since it uses as much as digits as its factorization.

218722169408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92365830 (or 92365820 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 50.

The spelling of 218722169408 in words is "two hundred eighteen billion, seven hundred twenty-two million, one hundred sixty-nine thousand, four hundred eight".