2205666761 has 2 divisors, whose sum is σ = 2205666762. Its totient is φ = 2205666760.

The previous prime is 2205666707. The next prime is 2205666769. The reversal of 2205666761 is 1676665022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2064793600 + 140873161 = 45440^2 + 11869^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2205666761 is a prime.

It is a super-2 number, since 2×2205666761² = 9729931721160462242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2205666769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1102833380 + 1102833381.

It is an arithmetic number, because the mean of its divisors is an integer number (1102833381).

Almost surely, 2^2205666761 is an apocalyptic number.

It is an amenable number.

2205666761 is a deficient number, since it is larger than the sum of its proper divisors (1).

2205666761 is an equidigital number, since it uses as much as digits as its factorization.

2205666761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 41.

The square root of 2205666761 is about 46964.5266238253. The cubic root of 2205666761 is about 1301.7071774459.

The spelling of 2205666761 in words is "two billion, two hundred five million, six hundred sixty-six thousand, seven hundred sixty-one".