201061041661 has 4 divisors (see below), whose sum is σ = 201070946524. Its totient is φ = 201051136800.

The previous prime is 201061041617. The next prime is 201061041667. The reversal of 201061041661 is 166140160102.

201061041661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 109424670436 + 91636371225 = 330794^2 + 302715^2 .

It is a cyclic number.

It is not a de Polignac number, because 201061041661 - 2⁹ = 201061041149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201061041667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4921920 + ... + 4962601.

It is an arithmetic number, because the mean of its divisors is an integer number (50267736631).

Almost surely, 2^201061041661 is an apocalyptic number.

It is an amenable number.

201061041661 is a deficient number, since it is larger than the sum of its proper divisors (9904863).

201061041661 is an equidigital number, since it uses as much as digits as its factorization.

201061041661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9904862.

The product of its (nonzero) digits is 1728, while the sum is 28.

The spelling of 201061041661 in words is "two hundred one billion, sixty-one million, forty-one thousand, six hundred sixty-one".