66454081 has 2 divisors, whose sum is σ = 66454082. Its totient is φ = 66454080.

The previous prime is 66454067. The next prime is 66454097. The reversal of 66454081 is 18045466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66259600 + 194481 = 8140^2 + 441^2 .

It is a cyclic number.

It is not a de Polignac number, because 66454081 - 2¹¹ = 66452033 is a prime.

It is a super-2 number, since 2×66454081² = 8832289763109122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66454181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33227040 + 33227041.

It is an arithmetic number, because the mean of its divisors is an integer number (33227041).

Almost surely, 2^66454081 is an apocalyptic number.

It is an amenable number.

66454081 is a deficient number, since it is larger than the sum of its proper divisors (1).

66454081 is an equidigital number, since it uses as much as digits as its factorization.

66454081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 66454081 is about 8151.9372544200. The cubic root of 66454081 is about 405.0486777847.

It can be divided in two parts, 664 and 54081, that added together give a palindrome (54745).

The spelling of 66454081 in words is "sixty-six million, four hundred fifty-four thousand, eighty-one".