65811841 has 2 divisors, whose sum is σ = 65811842. Its totient is φ = 65811840.

The previous prime is 65811829. The next prime is 65811857. The reversal of 65811841 is 14811856.

It is a happy number.

65811841 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64963600 + 848241 = 8060^2 + 921^2 .

It is a cyclic number.

It is not a de Polignac number, because 65811841 - 2⁹ = 65811329 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 65811797 and 65811806.

It is not a weakly prime, because it can be changed into another prime (65811821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32905920 + 32905921.

It is an arithmetic number, because the mean of its divisors is an integer number (32905921).

Almost surely, 2^65811841 is an apocalyptic number.

It is an amenable number.

65811841 is a deficient number, since it is larger than the sum of its proper divisors (1).

65811841 is an equidigital number, since it uses as much as digits as its factorization.

65811841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7680, while the sum is 34.

The square root of 65811841 is about 8112.4497533113. The cubic root of 65811841 is about 403.7395983096.

It can be divided in two parts, 658 and 11841, that multiplied together give a triangular number (7791378 = T₃₉₄₇).

The spelling of 65811841 in words is "sixty-five million, eight hundred eleven thousand, eight hundred forty-one".