68195635218 has 48 divisors (see below), whose sum is σ = 156474859320. Its totient is φ = 21391147008.

The previous prime is 68195635217. The next prime is 68195635243. The reversal of 68195635218 is 81253659186.

68195635218 is a `hidden beast` number, since 6 + 8 + 19 + 563 + 52 + 18 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 63611397369 + 4584237849 = 252213^2 + 67707^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (68195635217) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2291538 + ... + 2321106.

Almost surely, 2^68195635218 is an apocalyptic number.

68195635218 is an abundant number, since it is smaller than the sum of its proper divisors (88279224102).

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

68195635218 is a wasteful number, since it uses less digits than its factorization.

68195635218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37131 (or 37128 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 54.

The spelling of 68195635218 in words is "sixty-eight billion, one hundred ninety-five million, six hundred thirty-five thousand, two hundred eighteen".