2321806661 has 2 divisors, whose sum is σ = 2321806662. Its totient is φ = 2321806660.

The previous prime is 2321806657. The next prime is 2321806667. The reversal of 2321806661 is 1666081232.

2321806661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1260676036 + 1061130625 = 35506^2 + 32575^2 .

It is a cyclic number.

It is not a de Polignac number, because 2321806661 - 2² = 2321806657 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2321806667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1160903330 + 1160903331.

It is an arithmetic number, because the mean of its divisors is an integer number (1160903331).

Almost surely, 2^2321806661 is an apocalyptic number.

It is an amenable number.

2321806661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2321806661 is an equidigital number, since it uses as much as digits as its factorization.

2321806661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 2321806661 is about 48185.1290441356. The cubic root of 2321806661 is about 1324.1647349431.

Adding to 2321806661 its reverse (1666081232), we get a palindrome (3987887893).

The spelling of 2321806661 in words is "two billion, three hundred twenty-one million, eight hundred six thousand, six hundred sixty-one".