218456476878 has 16 divisors (see below), whose sum is σ = 438537168720. Its totient is φ = 72548123136.

The previous prime is 218456476831. The next prime is 218456476879. The reversal of 218456476878 is 878674654812.

218456476878 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218456476879) 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 7 ways as a sum of consecutive naturals, for example, 67673875 + ... + 67677102.

It is an arithmetic number, because the mean of its divisors is an integer number (27408573045).

Almost surely, 2^218456476878 is an apocalyptic number.

218456476878 is an abundant number, since it is smaller than the sum of its proper divisors (220080691842).

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

218456476878 is a wasteful number, since it uses less digits than its factorization.

218456476878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135351251.

The product of its digits is 144506880, while the sum is 66.

The spelling of 218456476878 in words is "two hundred eighteen billion, four hundred fifty-six million, four hundred seventy-six thousand, eight hundred seventy-eight".