66135449 has 2 divisors, whose sum is σ = 66135450. Its totient is φ = 66135448.

The previous prime is 66135437. The next prime is 66135463. The reversal of 66135449 is 94453166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47169424 + 18966025 = 6868^2 + 4355^2 .

It is a cyclic number.

It is not a de Polignac number, because 66135449 - 2⁸ = 66135193 is a prime.

It is a super-2 number, since 2×66135449² = 8747795228863202, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (66135749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33067724 + 33067725.

It is an arithmetic number, because the mean of its divisors is an integer number (33067725).

Almost surely, 2^66135449 is an apocalyptic number.

It is an amenable number.

66135449 is a deficient number, since it is larger than the sum of its proper divisors (1).

66135449 is an equidigital number, since it uses as much as digits as its factorization.

66135449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 38.

The square root of 66135449 is about 8132.3704416363. The cubic root of 66135449 is about 404.4002686732.

The spelling of 66135449 in words is "sixty-six million, one hundred thirty-five thousand, four hundred forty-nine".