3321166561 has 2 divisors, whose sum is σ = 3321166562. Its totient is φ = 3321166560.

The previous prime is 3321166547. The next prime is 3321166571. The reversal of 3321166561 is 1656611233.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2141930961 + 1179235600 = 46281^2 + 34340^2 .

It is an emirp because it is prime and its reverse (1656611233) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3321166561 - 2¹⁵ = 3321133793 is a prime.

It is a super-2 number, since 2×3321166561² = 22060294651809133442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3321166571) 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, 1660583280 + 1660583281.

It is an arithmetic number, because the mean of its divisors is an integer number (1660583281).

Almost surely, 2^3321166561 is an apocalyptic number.

It is an amenable number.

3321166561 is a deficient number, since it is larger than the sum of its proper divisors (1).

3321166561 is an equidigital number, since it uses as much as digits as its factorization.

3321166561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 34.

The square root of 3321166561 is about 57629.5632553293. The cubic root of 3321166561 is about 1491.9818920349.

Adding to 3321166561 its reverse (1656611233), we get a palindrome (4977777794).

The spelling of 3321166561 in words is "three billion, three hundred twenty-one million, one hundred sixty-six thousand, five hundred sixty-one".