66358081 has 2 divisors, whose sum is σ = 66358082. Its totient is φ = 66358080.

The previous prime is 66358079. The next prime is 66358087. The reversal of 66358081 is 18085366.

66358081 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., 36108081 + 30250000 = 6009^2 + 5500^2 .

It is a cyclic number.

It is not a de Polignac number, because 66358081 - 2¹ = 66358079 is a prime.

It is a super-2 number, since 2×66358081² = 8806789828005122, which contains 22 as substring.

Together with 66358079, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 66358081.

It is not a weakly prime, because it can be changed into another prime (66358087) 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, 33179040 + 33179041.

It is an arithmetic number, because the mean of its divisors is an integer number (33179041).

Almost surely, 2^66358081 is an apocalyptic number.

It is an amenable number.

66358081 is a deficient number, since it is larger than the sum of its proper divisors (1).

66358081 is an equidigital number, since it uses as much as digits as its factorization.

66358081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 66358081 is about 8146.0469554257. The cubic root of 66358081 is about 404.8535384651.

The spelling of 66358081 in words is "sixty-six million, three hundred fifty-eight thousand, eighty-one".