2042304306661 has 4 divisors (see below), whose sum is σ = 2042328849772. Its totient is φ = 2042279763552.

The previous prime is 2042304306643. The next prime is 2042304306727. The reversal of 2042304306661 is 1666034032402.

It is a happy number.

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 888860526436 + 1153443780225 = 942794^2 + 1073985^2 .

It is a cyclic number.

It is not a de Polignac number, because 2042304306661 - 2²³ = 2042295918053 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 2042304306661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2042304306461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12146310 + ... + 12313303.

It is an arithmetic number, because the mean of its divisors is an integer number (510582212443).

Almost surely, 2^{2042304306661} is an apocalyptic number.

It is an amenable number.

2042304306661 is a deficient number, since it is larger than the sum of its proper divisors (24543111).

2042304306661 is an equidigital number, since it uses as much as digits as its factorization.

2042304306661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24543110.

The product of its (nonzero) digits is 124416, while the sum is 37.

The spelling of 2042304306661 in words is "two trillion, forty-two billion, three hundred four million, three hundred six thousand, six hundred sixty-one".