218535637521612 has 24 divisors (see below), whose sum is σ = 514682062203456. Its totient is φ = 72164416128208.

The previous prime is 218535637521599. The next prime is 218535637521637. The reversal of 218535637521612 is 216125736535812.

It is a happy 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, 85099546038 + ... + 85099548605.

It is an arithmetic number, because the mean of its divisors is an integer number (21445085925144).

Almost surely, 2^{218535637521612} is an apocalyptic number.

It is an amenable number.

218535637521612 is an abundant number, since it is smaller than the sum of its proper divisors (296146424681844).

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

218535637521612 is a wasteful number, since it uses less digits than its factorization.

218535637521612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170199094757 (or 170199094755 counting only the distinct ones).

The product of its digits is 18144000, while the sum is 57.

The spelling of 218535637521612 in words is "two hundred eighteen trillion, five hundred thirty-five billion, six hundred thirty-seven million, five hundred twenty-one thousand, six hundred twelve".