218408547540 has 48 divisors (see below), whose sum is σ = 647517108672. Its totient is φ = 54816262656.

The previous prime is 218408547499. The next prime is 218408547563. The reversal of 218408547540 is 45745804812.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 218408547540.

It is a congruent 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, 107061994 + ... + 107064033.

It is an arithmetic number, because the mean of its divisors is an integer number (13489939764).

Almost surely, 2^218408547540 is an apocalyptic number.

218408547540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

218408547540 is an abundant number, since it is smaller than the sum of its proper divisors (429108561132).

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

218408547540 is a wasteful number, since it uses less digits than its factorization.

218408547540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214126056 (or 214126054 counting only the distinct ones).

The product of its (nonzero) digits is 1433600, while the sum is 48.

The spelling of 218408547540 in words is "two hundred eighteen billion, four hundred eight million, five hundred forty-seven thousand, five hundred forty".