65591161 has 2 divisors, whose sum is σ = 65591162. Its totient is φ = 65591160.

The previous prime is 65591033. The next prime is 65591167. The reversal of 65591161 is 16119556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42981136 + 22610025 = 6556^2 + 4755^2 .

It is a cyclic number.

It is not a de Polignac number, because 65591161 - 2⁷ = 65591033 is a prime.

It is not a weakly prime, because it can be changed into another prime (65591167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32795580 + 32795581.

It is an arithmetic number, because the mean of its divisors is an integer number (32795581).

Almost surely, 2^65591161 is an apocalyptic number.

It is an amenable number.

65591161 is a deficient number, since it is larger than the sum of its proper divisors (1).

65591161 is an equidigital number, since it uses as much as digits as its factorization.

65591161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8100, while the sum is 34.

The square root of 65591161 is about 8098.8370152757. The cubic root of 65591161 is about 403.2878203013.

The spelling of 65591161 in words is "sixty-five million, five hundred ninety-one thousand, one hundred sixty-one".