201660612172 has 12 divisors (see below), whose sum is σ = 355684860160. Its totient is φ = 100036366416.

The previous prime is 201660612137. The next prime is 201660612187. The reversal of 201660612172 is 271216066102.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198484347 + ... + 198485362.

Almost surely, 2^201660612172 is an apocalyptic number.

It is an amenable number.

201660612172 is a deficient number, since it is larger than the sum of its proper divisors (154024247988).

201660612172 is a wasteful number, since it uses less digits than its factorization.

201660612172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396969840 (or 396969838 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

Adding to 201660612172 its reverse (271216066102), we get a palindrome (472876678274).

The spelling of 201660612172 in words is "two hundred one billion, six hundred sixty million, six hundred twelve thousand, one hundred seventy-two".