2120056661 has 2 divisors, whose sum is σ = 2120056662. Its totient is φ = 2120056660.

The previous prime is 2120056637. The next prime is 2120056667. The reversal of 2120056661 is 1666500212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1231659025 + 888397636 = 35095^2 + 29806^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2120056661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2120056667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060028330 + 1060028331.

It is an arithmetic number, because the mean of its divisors is an integer number (1060028331).

Almost surely, 2^2120056661 is an apocalyptic number.

It is an amenable number.

2120056661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120056661 is an equidigital number, since it uses as much as digits as its factorization.

2120056661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 2120056661 is about 46044.0730279153. The cubic root of 2120056661 is about 1284.6431023455.

Adding to 2120056661 its reverse (1666500212), we get a palindrome (3786556873).

The spelling of 2120056661 in words is "two billion, one hundred twenty million, fifty-six thousand, six hundred sixty-one".