65684081 has 2 divisors, whose sum is σ = 65684082. Its totient is φ = 65684080.

The previous prime is 65684063. The next prime is 65684147. The reversal of 65684081 is 18048656.

65684081 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., 48874081 + 16810000 = 6991^2 + 4100^2 .

It is a cyclic number.

It is not a de Polignac number, because 65684081 - 2²² = 61489777 is a prime.

It is a super-2 number, since 2×65684081² = 8628796993629122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (65684041) 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, 32842040 + 32842041.

It is an arithmetic number, because the mean of its divisors is an integer number (32842041).

Almost surely, 2^65684081 is an apocalyptic number.

It is an amenable number.

65684081 is a deficient number, since it is larger than the sum of its proper divisors (1).

65684081 is an equidigital number, since it uses as much as digits as its factorization.

65684081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 65684081 is about 8104.5716111341. The cubic root of 65684081 is about 403.4781702506.

The spelling of 65684081 in words is "sixty-five million, six hundred eighty-four thousand, eighty-one".