218806543840 has 48 divisors (see below), whose sum is σ = 517145776560. Its totient is φ = 87486161920.

The previous prime is 218806543819. The next prime is 218806543849. The reversal of 218806543840 is 48345608812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218806543849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102156 + ... + 669364.

It is an arithmetic number, because the mean of its divisors is an integer number (10773870345).

Almost surely, 2^218806543840 is an apocalyptic number.

218806543840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

218806543840 is an abundant number, since it is smaller than the sum of its proper divisors (298339232720).

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

218806543840 is a wasteful number, since it uses less digits than its factorization.

218806543840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569635 (or 569627 counting only the distinct ones).

The product of its (nonzero) digits is 1474560, while the sum is 49.

The spelling of 218806543840 in words is "two hundred eighteen billion, eight hundred six million, five hundred forty-three thousand, eight hundred forty".