2110005661 has 2 divisors, whose sum is σ = 2110005662. Its totient is φ = 2110005660.

The previous prime is 2110005629. The next prime is 2110005679. The reversal of 2110005661 is 1665000112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1649903161 + 460102500 = 40619^2 + 21450^2 .

It is a cyclic number.

It is not a de Polignac number, because 2110005661 - 2⁵ = 2110005629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2110005691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1055002830 + 1055002831.

It is an arithmetic number, because the mean of its divisors is an integer number (1055002831).

Almost surely, 2^2110005661 is an apocalyptic number.

It is an amenable number.

2110005661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2110005661 is an equidigital number, since it uses as much as digits as its factorization.

2110005661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 2110005661 is about 45934.7979314158. The cubic root of 2110005661 is about 1282.6097594367.

Adding to 2110005661 its reverse (1665000112), we get a palindrome (3775005773).

The spelling of 2110005661 in words is "two billion, one hundred ten million, five thousand, six hundred sixty-one".