218840053887 has 512 divisors, whose sum is σ = 459348377600. Its totient is φ = 99769190400.

The previous prime is 218840053877. The next prime is 218840053909. The reversal of 218840053887 is 788350048812.

218840053887 is a `hidden beast` number, since 2 + 188 + 400 + 53 + 8 + 8 + 7 = 666.

It is not a de Polignac number, because 218840053887 - 2⁴ = 218840053871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218840053847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 511 ways as a sum of consecutive naturals, for example, 3266269428 + ... + 3266269494.

It is an arithmetic number, because the mean of its divisors is an integer number (897164800).

Almost surely, 2^218840053887 is an apocalyptic number.

218840053887 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

218840053887 is an abundant number, since it is smaller than the sum of its proper divisors (240508323713).

218840053887 is a wasteful number, since it uses less digits than its factorization.

218840053887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244 (or 238 counting only the distinct ones).

The product of its (nonzero) digits is 3440640, while the sum is 54.

The spelling of 218840053887 in words is "two hundred eighteen billion, eight hundred forty million, fifty-three thousand, eight hundred eighty-seven".