218555485 has 16 divisors (see below), whose sum is σ = 285203376. Its totient is φ = 160109568.

The previous prime is 218555479. The next prime is 218555551. The reversal of 218555485 is 584555812.

218555485 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 8 ways, for example, as 75585636 + 142969849 = 8694^2 + 11957^2 .

It is a cyclic number.

It is not a de Polignac number, because 218555485 - 2¹³ = 218547293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31602 + ... + 37891.

It is an arithmetic number, because the mean of its divisors is an integer number (17825211).

Almost surely, 2^218555485 is an apocalyptic number.

It is an amenable number.

218555485 is a deficient number, since it is larger than the sum of its proper divisors (66647891).

218555485 is a wasteful number, since it uses less digits than its factorization.

218555485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69552.

The product of its digits is 320000, while the sum is 43.

The square root of 218555485 is about 14783.6221880837. The cubic root of 218555485 is about 602.3569192446.

The spelling of 218555485 in words is "two hundred eighteen million, five hundred fifty-five thousand, four hundred eighty-five".