65811223 has 2 divisors, whose sum is σ = 65811224. Its totient is φ = 65811222.

The previous prime is 65811217. The next prime is 65811227. The reversal of 65811223 is 32211856.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65811223 - 2⁹ = 65810711 is a prime.

It is a super-2 number, since 2×65811223² = 8662234145511458, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 65811191 and 65811200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65811227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32905611 + 32905612.

It is an arithmetic number, because the mean of its divisors is an integer number (32905612).

Almost surely, 2^65811223 is an apocalyptic number.

65811223 is a deficient number, since it is larger than the sum of its proper divisors (1).

65811223 is an equidigital number, since it uses as much as digits as its factorization.

65811223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 28.

The square root of 65811223 is about 8112.4116636177. The cubic root of 65811223 is about 403.7383345459.

It can be divided in two parts, 658 and 11223, that added together give a square (11881 = 109²).

The spelling of 65811223 in words is "sixty-five million, eight hundred eleven thousand, two hundred twenty-three".