201055661 has 4 divisors (see below), whose sum is σ = 201128892. Its totient is φ = 200982432.

The previous prime is 201055633. The next prime is 201055667. The reversal of 201055661 is 166550102.

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

It can be written as a sum of positive squares in 2 ways, for example, as 48038761 + 153016900 = 6931^2 + 12370^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201055661 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 201055661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201055667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32330 + ... + 38043.

It is an arithmetic number, because the mean of its divisors is an integer number (50282223).

Almost surely, 2^201055661 is an apocalyptic number.

It is an amenable number.

201055661 is a deficient number, since it is larger than the sum of its proper divisors (73231).

201055661 is an equidigital number, since it uses as much as digits as its factorization.

201055661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73230.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 201055661 is about 14179.4097549933. The cubic root of 201055661 is about 585.8306664378.

The spelling of 201055661 in words is "two hundred one million, fifty-five thousand, six hundred sixty-one".