66134401 has 2 divisors, whose sum is σ = 66134402. Its totient is φ = 66134400.

The previous prime is 66134389. The next prime is 66134417. The reversal of 66134401 is 10443166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50126400 + 16008001 = 7080^2 + 4001^2 .

It is a cyclic number.

It is not a de Polignac number, because 66134401 - 2⁷ = 66134273 is a prime.

It is not a weakly prime, because it can be changed into another prime (66134491) 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, 33067200 + 33067201.

It is an arithmetic number, because the mean of its divisors is an integer number (33067201).

Almost surely, 2^66134401 is an apocalyptic number.

It is an amenable number.

66134401 is a deficient number, since it is larger than the sum of its proper divisors (1).

66134401 is an equidigital number, since it uses as much as digits as its factorization.

66134401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 66134401 is about 8132.3060075233. The cubic root of 66134401 is about 404.3981325836.

Adding to 66134401 its reverse (10443166), we get a palindrome (76577567).

The spelling of 66134401 in words is "sixty-six million, one hundred thirty-four thousand, four hundred one".