218311438856 has 32 divisors (see below), whose sum is σ = 476636840640. Its totient is φ = 91796722368.

The previous prime is 218311438819. The next prime is 218311438949. The reversal of 218311438856 is 658834113812.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36774566 + ... + 36780501.

It is an arithmetic number, because the mean of its divisors is an integer number (14894901270).

Almost surely, 2^218311438856 is an apocalyptic number.

It is an amenable number.

218311438856 is an abundant number, since it is smaller than the sum of its proper divisors (258325401784).

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

218311438856 is a wasteful number, since it uses less digits than its factorization.

218311438856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73555133 (or 73555129 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 50.

The spelling of 218311438856 in words is "two hundred eighteen billion, three hundred eleven million, four hundred thirty-eight thousand, eight hundred fifty-six".