218187878916 has 48 divisors (see below), whose sum is σ = 581868241920. Its totient is φ = 62335762080.

The previous prime is 218187878897. The next prime is 218187878933. The reversal of 218187878916 is 619878781812.

It is a happy 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, 1592281 + ... + 1723871.

It is an arithmetic number, because the mean of its divisors is an integer number (12122255040).

Almost surely, 2^218187878916 is an apocalyptic number.

It is an amenable number.

218187878916 is an abundant number, since it is smaller than the sum of its proper divisors (363680363004).

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

218187878916 is a wasteful number, since it uses less digits than its factorization.

218187878916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151344 (or 151342 counting only the distinct ones).

The product of its digits is 21676032, while the sum is 66.

The spelling of 218187878916 in words is "two hundred eighteen billion, one hundred eighty-seven million, eight hundred seventy-eight thousand, nine hundred sixteen".