218993954648 has 32 divisors (see below), whose sum is σ = 474545498400. Its totient is φ = 92800004352.

The previous prime is 218993954617. The next prime is 218993954659. The reversal of 218993954648 is 846459399812.

It is a happy number.

It is a congruent number.

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, 21964715 + ... + 21974682.

It is an arithmetic number, because the mean of its divisors is an integer number (14829546825).

Almost surely, 2^218993954648 is an apocalyptic number.

218993954648 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

218993954648 is an abundant number, since it is smaller than the sum of its proper divisors (255551543752).

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

218993954648 is a wasteful number, since it uses less digits than its factorization.

218993954648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43939499 (or 43939495 counting only the distinct ones).

The product of its digits is 134369280, while the sum is 68.

The spelling of 218993954648 in words is "two hundred eighteen billion, nine hundred ninety-three million, nine hundred fifty-four thousand, six hundred forty-eight".