218537674475868 has 72 divisors (see below), whose sum is σ = 602783846071680. Its totient is φ = 66207092355360.

The previous prime is 218537674475867. The next prime is 218537674475951. The reversal of 218537674475868 is 868574476735812.

218537674475868 is a `hidden beast` number, since 2 + 1 + 8 + 5 + 3 + 7 + 67 + 4 + 475 + 86 + 8 = 666.

It is a super-3 number, since 3×218537674475868³ (a number of 44 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218537674475867) 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, 66925648 + ... + 70115031.

Almost surely, 2^{218537674475868} is an apocalyptic number.

It is an amenable number.

218537674475868 is an abundant number, since it is smaller than the sum of its proper divisors (384246171595812).

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

218537674475868 is a wasteful number, since it uses less digits than its factorization.

218537674475868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137044727 (or 137044722 counting only the distinct ones).

The product of its digits is 15173222400, while the sum is 81.

The spelling of 218537674475868 in words is "two hundred eighteen trillion, five hundred thirty-seven billion, six hundred seventy-four million, four hundred seventy-five thousand, eight hundred sixty-eight".