218306220530 has 16 divisors (see below), whose sum is σ = 393858713304. Its totient is φ = 87120817920.

The previous prime is 218306220523. The next prime is 218306220553. The reversal of 218306220530 is 35022603812.

It can be written as a sum of positive squares in 4 ways, for example, as 140615250169 + 77690970361 = 374987^2 + 278731^2 .

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, 25204241 + ... + 25212900.

Almost surely, 2^218306220530 is an apocalyptic number.

218306220530 is a deficient number, since it is larger than the sum of its proper divisors (175552492774).

218306220530 is a wasteful number, since it uses less digits than its factorization.

218306220530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50417581.

The product of its (nonzero) digits is 17280, while the sum is 32.

The spelling of 218306220530 in words is "two hundred eighteen billion, three hundred six million, two hundred twenty thousand, five hundred thirty".