218051138768 has 20 divisors (see below), whose sum is σ = 422496234180. Its totient is φ = 109019852544.

The previous prime is 218051138761. The next prime is 218051138771. The reversal of 218051138768 is 867831150812.

It can be written as a sum of positive squares in 2 ways, for example, as 180635200144 + 37415938624 = 425012^2 + 193432^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218051138761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33755 + ... + 661242.

It is an arithmetic number, because the mean of its divisors is an integer number (21124811709).

Almost surely, 2^218051138768 is an apocalyptic number.

It is an amenable number.

218051138768 is a deficient number, since it is larger than the sum of its proper divisors (204445095412).

218051138768 is a wasteful number, since it uses less digits than its factorization.

218051138768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 714614 (or 714608 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 50.

The spelling of 218051138768 in words is "two hundred eighteen billion, fifty-one million, one hundred thirty-eight thousand, seven hundred sixty-eight".