666444466 has 4 divisors (see below), whose sum is σ = 999666702. Its totient is φ = 333222232.

The previous prime is 666444461. The next prime is 666444469. The reversal of 666444466 is 664444666.

666444466 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 634284225 + 32160241 = 25185^2 + 5671^2 .

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (666444461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166611115 + ... + 166611118.

Almost surely, 2^666444466 is an apocalyptic number.

666444466 is a deficient number, since it is larger than the sum of its proper divisors (333222236).

666444466 is a wasteful number, since it uses less digits than its factorization.

666444466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333222235.

The product of its digits is 1990656, while the sum is 46.

The square root of 666444466 is about 25815.5857187088. The cubic root of 666444466 is about 873.4833988706.

The spelling of 666444466 in words is "six hundred sixty-six million, four hundred forty-four thousand, four hundred sixty-six".