201668517 has 12 divisors (see below), whose sum is σ = 291439980. Its totient is φ = 134380608.

The previous prime is 201668497. The next prime is 201668539. The reversal of 201668517 is 715866102.

It can be written as a sum of positive squares in 2 ways, for example, as 10150596 + 191517921 = 3186^2 + 13839^2 .

It is not a de Polignac number, because 201668517 - 2²³ = 193279909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201668017) 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 11 ways as a sum of consecutive naturals, for example, 20959 + ... + 29027.

It is an arithmetic number, because the mean of its divisors is an integer number (24286665).

Almost surely, 2^201668517 is an apocalyptic number.

It is an amenable number.

201668517 is a deficient number, since it is larger than the sum of its proper divisors (89771463).

201668517 is a wasteful number, since it uses less digits than its factorization.

201668517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10852 (or 10849 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 201668517 is about 14201.0040842188. The cubic root of 201668517 is about 586.4253038573.

The spelling of 201668517 in words is "two hundred one million, six hundred sixty-eight thousand, five hundred seventeen".