201668 has 6 divisors (see below), whose sum is σ = 352926. Its totient is φ = 100832.

The previous prime is 201667. The next prime is 201673. The reversal of 201668 is 866102.

201668 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 158404 + 43264 = 398^2 + 208^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (201661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25205 + ... + 25212.

It is an arithmetic number, because the mean of its divisors is an integer number (58821).

2²⁰¹⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

201668 is a deficient number, since it is larger than the sum of its proper divisors (151258).

201668 is a wasteful number, since it uses less digits than its factorization.

201668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50421 (or 50419 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 201668 is about 449.0746040470. The cubic root of 201668 is about 58.6424802734.

Multiplying 201668 by its sum of digits (23), we get a palindrome (4638364).

The spelling of 201668 in words is "two hundred one thousand, six hundred sixty-eight".