201660523 has 4 divisors (see below), whose sum is σ = 201975768. Its totient is φ = 201345280.

The previous prime is 201660499. The next prime is 201660533. The reversal of 201660523 is 325066102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 201660523 - 2⁵ = 201660491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201660533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156661 + ... + 157942.

It is an arithmetic number, because the mean of its divisors is an integer number (50493942).

Almost surely, 2^201660523 is an apocalyptic number.

201660523 is a deficient number, since it is larger than the sum of its proper divisors (315245).

201660523 is an equidigital number, since it uses as much as digits as its factorization.

201660523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315244.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 201660523 is about 14200.7226224583. The cubic root of 201660523 is about 586.4175552576.

The spelling of 201660523 in words is "two hundred one million, six hundred sixty thousand, five hundred twenty-three".