65805811 has 2 divisors, whose sum is σ = 65805812. Its totient is φ = 65805810.

The previous prime is 65805787. The next prime is 65805823. The reversal of 65805811 is 11850856.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65805811 - 2¹¹ = 65803763 is a prime.

It is a super-2 number, since 2×65805811² = 8660809522735442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (65805851) 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, 32902905 + 32902906.

It is an arithmetic number, because the mean of its divisors is an integer number (32902906).

Almost surely, 2^65805811 is an apocalyptic number.

65805811 is a deficient number, since it is larger than the sum of its proper divisors (1).

65805811 is an equidigital number, since it uses as much as digits as its factorization.

65805811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9600, while the sum is 34.

The square root of 65805811 is about 8112.0780938056. The cubic root of 65805811 is about 403.7272670731.

The spelling of 65805811 in words is "sixty-five million, eight hundred five thousand, eight hundred eleven".