201665013 has 24 divisors (see below), whose sum is σ = 305104128. Its totient is φ = 118272000.

The previous prime is 201665003. The next prime is 201665021. The reversal of 201665013 is 310566102.

It is not a de Polignac number, because 201665013 - 2¹³ = 201656821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201665003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2293 + ... + 20213.

It is an arithmetic number, because the mean of its divisors is an integer number (12712672).

Almost surely, 2^201665013 is an apocalyptic number.

It is an amenable number.

201665013 is a deficient number, since it is larger than the sum of its proper divisors (103439115).

201665013 is a wasteful number, since it uses less digits than its factorization.

201665013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17977 (or 17966 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 201665013 is about 14200.8807121249. The cubic root of 201665013 is about 586.4219074485.

The spelling of 201665013 in words is "two hundred one million, six hundred sixty-five thousand, thirteen".