201660612065549 has 32 divisors (see below), whose sum is σ = 253977703440384. Its totient is φ = 155840150854080.

The previous prime is 201660612065531. The next prime is 201660612065587. The reversal of 201660612065549 is 945560216066102.

It is a happy number.

201660612065549 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 201660612065549 - 2³² = 201656317098253 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 201660612065549.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201660612065509) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 126155204 + ... + 127743714.

It is an arithmetic number, because the mean of its divisors is an integer number (7936803232512).

Almost surely, 2^{201660612065549} is an apocalyptic number.

It is an amenable number.

201660612065549 is a deficient number, since it is larger than the sum of its proper divisors (52317091374835).

201660612065549 is a wasteful number, since it uses less digits than its factorization.

201660612065549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1621017.

The product of its (nonzero) digits is 4665600, while the sum is 53.

The spelling of 201660612065549 in words is "two hundred one trillion, six hundred sixty billion, six hundred twelve million, sixty-five thousand, five hundred forty-nine".