218919180544 has 27 divisors (see below), whose sum is σ = 436998151723. Its totient is φ = 109455847168.

The previous prime is 218919180521. The next prime is 218919180563. The reversal of 218919180544 is 445081919812.

The square root of 218919180544 is 467888.

It is a perfect power (a square), and thus also a powerful number.

It is a super-2 number, since 2×218919180544² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 218919180491 and 218919180500.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 7471587 + ... + 7500829.

Almost surely, 2^218919180544 is an apocalyptic number.

218919180544 is the 467888-th square number.

It is an amenable number.

218919180544 is a deficient number, since it is larger than the sum of its proper divisors (218078971179).

218919180544 is an frugal number, since it uses more digits than its factorization.

218919180544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58502 (or 29245 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 52.

The spelling of 218919180544 in words is "two hundred eighteen billion, nine hundred nineteen million, one hundred eighty thousand, five hundred forty-four".