218162506768 has 20 divisors (see below), whose sum is σ = 422738639548. Its totient is φ = 109068664320.

The previous prime is 218162506753. The next prime is 218162506787. The reversal of 218162506768 is 867605261812.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 191413250064 + 26749256704 = 437508^2 + 163552^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 643053 + ... + 921868.

Almost surely, 2^218162506768 is an apocalyptic number.

It is an amenable number.

218162506768 is a deficient number, since it is larger than the sum of its proper divisors (204576132780).

218162506768 is a wasteful number, since it uses less digits than its factorization.

218162506768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1573642 (or 1573636 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 52.

The spelling of 218162506768 in words is "two hundred eighteen billion, one hundred sixty-two million, five hundred six thousand, seven hundred sixty-eight".