66634081 has 2 divisors, whose sum is σ = 66634082. Its totient is φ = 66634080.

The previous prime is 66634037. The next prime is 66634093. The reversal of 66634081 is 18043666.

66634081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63361600 + 3272481 = 7960^2 + 1809^2 .

It is a cyclic number.

It is not a de Polignac number, because 66634081 - 2¹⁷ = 66503009 is a prime.

It is a super-2 number, since 2×66634081² = 8880201501429122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66634031) 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, 33317040 + 33317041.

It is an arithmetic number, because the mean of its divisors is an integer number (33317041).

Almost surely, 2^66634081 is an apocalyptic number.

It is an amenable number.

66634081 is a deficient number, since it is larger than the sum of its proper divisors (1).

66634081 is an equidigital number, since it uses as much as digits as its factorization.

66634081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 66634081 is about 8162.9701089738. The cubic root of 66634081 is about 405.4140580693.

The spelling of 66634081 in words is "sixty-six million, six hundred thirty-four thousand, eighty-one".