218388231464 has 48 divisors (see below), whose sum is σ = 449644439520. Its totient is φ = 99374882880.

The previous prime is 218388231437. The next prime is 218388231511. The reversal of 218388231464 is 464132883812.

It is a super-3 number, since 3×218388231464³ (a number of 35 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1041542 + ... + 1233525.

It is an arithmetic number, because the mean of its divisors is an integer number (9367592490).

Almost surely, 2^218388231464 is an apocalyptic number.

It is an amenable number.

218388231464 is an abundant number, since it is smaller than the sum of its proper divisors (231256208056).

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

218388231464 is a wasteful number, since it uses less digits than its factorization.

218388231464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2275170 (or 2275153 counting only the distinct ones).

The product of its digits is 1769472, while the sum is 50.

The spelling of 218388231464 in words is "two hundred eighteen billion, three hundred eighty-eight million, two hundred thirty-one thousand, four hundred sixty-four".