218897851840 has 56 divisors (see below), whose sum is σ = 521351999712. Its totient is φ = 87542092800.

The previous prime is 218897851789. The next prime is 218897851853. The reversal of 218897851840 is 48158798812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1648402 + ... + 1776238.

Almost surely, 2^218897851840 is an apocalyptic number.

218897851840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

218897851840 is an abundant number, since it is smaller than the sum of its proper divisors (302454147872).

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

218897851840 is a wasteful number, since it uses less digits than its factorization.

218897851840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133205 (or 133195 counting only the distinct ones).

The product of its (nonzero) digits is 10321920, while the sum is 61.

The spelling of 218897851840 in words is "two hundred eighteen billion, eight hundred ninety-seven million, eight hundred fifty-one thousand, eight hundred forty".