1320065161 has 2 divisors, whose sum is σ = 1320065162. Its totient is φ = 1320065160.

The previous prime is 1320065137. The next prime is 1320065183. The reversal of 1320065161 is 1615600231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 871430400 + 448634761 = 29520^2 + 21181^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320065161 - 2⁵ = 1320065129 is a prime.

It is not a weakly prime, because it can be changed into another prime (1320066161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660032580 + 660032581.

It is an arithmetic number, because the mean of its divisors is an integer number (660032581).

Almost surely, 2^1320065161 is an apocalyptic number.

It is an amenable number.

1320065161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320065161 is an equidigital number, since it uses as much as digits as its factorization.

1320065161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 1320065161 is about 36332.7009868521. The cubic root of 1320065161 is about 1096.9793604663.

Adding to 1320065161 its reverse (1615600231), we get a palindrome (2935665392).

The spelling of 1320065161 in words is "one billion, three hundred twenty million, sixty-five thousand, one hundred sixty-one".