3220661761 has 2 divisors, whose sum is σ = 3220661762. Its totient is φ = 3220661760.

The previous prime is 3220661753. The next prime is 3220661767. The reversal of 3220661761 is 1671660223.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3064286736 + 156375025 = 55356^2 + 12505^2 .

It is a cyclic number.

It is not a de Polignac number, because 3220661761 - 2³ = 3220661753 is a prime.

It is a super-2 number, since 2×3220661761² = 20745324357535242242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3220661767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1610330880 + 1610330881.

It is an arithmetic number, because the mean of its divisors is an integer number (1610330881).

Almost surely, 2^3220661761 is an apocalyptic number.

It is an amenable number.

3220661761 is a deficient number, since it is larger than the sum of its proper divisors (1).

3220661761 is an equidigital number, since it uses as much as digits as its factorization.

3220661761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 3220661761 is about 56750.8745395170. The cubic root of 3220661761 is about 1476.7774051230. Note that the first 3 decimals are identical.

The spelling of 3220661761 in words is "three billion, two hundred twenty million, six hundred sixty-one thousand, seven hundred sixty-one".