220311237218 has 6 divisors (see below), whose sum is σ = 330467851521. Its totient is φ = 110155286712.

The previous prime is 220311237217. The next prime is 220311237229. The reversal of 220311237218 is 812732113022.

It can be written as a sum of positive squares in 2 ways, for example, as 118561082929 + 101750154289 = 344327^2 + 318983^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=331897.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (220311237217) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 497846 + ... + 829742.

Almost surely, 2^220311237218 is an apocalyptic number.

220311237218 is a deficient number, since it is larger than the sum of its proper divisors (110156614303).

220311237218 is an frugal number, since it uses more digits than its factorization.

220311237218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663796 (or 331899 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

Multiplying 220311237218 by its sum of digits (32), we get a square (7049959590976 = 2655176²).

The spelling of 220311237218 in words is "two hundred twenty billion, three hundred eleven million, two hundred thirty-seven thousand, two hundred eighteen".