201660612065525 has 12 divisors (see below), whose sum is σ = 253791385216512. Its totient is φ = 158920601745840.

The previous prime is 201660612065509. The next prime is 201660612065531. The reversal of 201660612065525 is 525560216066102.

It is not a de Polignac number, because 201660612065525 - 2⁴ = 201660612065509 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 201660612065525.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60197195957 + ... + 60197199306.

It is an arithmetic number, because the mean of its divisors is an integer number (21149282101376).

Almost surely, 2^{201660612065525} is an apocalyptic number.

201660612065525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

201660612065525 is a deficient number, since it is larger than the sum of its proper divisors (52130773150987).

201660612065525 is a wasteful number, since it uses less digits than its factorization.

201660612065525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120394395340 (or 120394395335 counting only the distinct ones).

The product of its (nonzero) digits is 1296000, while the sum is 47.

The spelling of 201660612065525 in words is "two hundred one trillion, six hundred sixty billion, six hundred twelve million, sixty-five thousand, five hundred twenty-five".