201200661 has 12 divisors (see below), whose sum is σ = 307718892. Its totient is φ = 126243456.

The previous prime is 201200617. The next prime is 201200669. The reversal of 201200661 is 166002102.

It is a happy number.

201200661 is a `hidden beast` number, since 2 + 0 + 1 + 2 + 0 + 0 + 661 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 113422500 + 87778161 = 10650^2 + 9369^2 .

It is not a de Polignac number, because 201200661 - 2¹⁰ = 201199637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201200669) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 657366 + ... + 657671.

It is an arithmetic number, because the mean of its divisors is an integer number (25643241).

Almost surely, 2^201200661 is an apocalyptic number.

It is an amenable number.

201200661 is a deficient number, since it is larger than the sum of its proper divisors (106518231).

201200661 is a wasteful number, since it uses less digits than its factorization.

201200661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1315060 (or 1315057 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 201200661 is about 14184.5218812620. The cubic root of 201200661 is about 585.9714649837.

Adding to 201200661 its reverse (166002102), we get a palindrome (367202763).

The spelling of 201200661 in words is "two hundred one million, two hundred thousand, six hundred sixty-one".