66404066 has 16 divisors (see below), whose sum is σ = 101659320. Its totient is φ = 32524800.

The previous prime is 66404033. The next prime is 66404089. The reversal of 66404066 is 66040466.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 64240225 + 2163841 = 8015^2 + 1471^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17900 + ... + 21288.

Almost surely, 2^66404066 is an apocalyptic number.

66404066 is a deficient number, since it is larger than the sum of its proper divisors (35255254).

66404066 is a wasteful number, since it uses less digits than its factorization.

66404066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3589.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 66404066 is about 8148.8690012786. The cubic root of 66404066 is about 404.9470356995.

The spelling of 66404066 in words is "sixty-six million, four hundred four thousand, sixty-six".