65691617 has 2 divisors, whose sum is σ = 65691618. Its totient is φ = 65691616.

The previous prime is 65691599. The next prime is 65691629. The reversal of 65691617 is 71619656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64144081 + 1547536 = 8009^2 + 1244^2 .

It is a cyclic number.

It is not a de Polignac number, because 65691617 - 2¹⁰ = 65690593 is a prime.

It is not a weakly prime, because it can be changed into another prime (65691667) 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, 32845808 + 32845809.

It is an arithmetic number, because the mean of its divisors is an integer number (32845809).

Almost surely, 2^65691617 is an apocalyptic number.

It is an amenable number.

65691617 is a deficient number, since it is larger than the sum of its proper divisors (1).

65691617 is an equidigital number, since it uses as much as digits as its factorization.

65691617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 41.

The square root of 65691617 is about 8105.0365205840. The cubic root of 65691617 is about 403.4936001446.

The spelling of 65691617 in words is "sixty-five million, six hundred ninety-one thousand, six hundred seventeen".