66000667 has 4 divisors (see below), whose sum is σ = 66053160. Its totient is φ = 65948176.

The previous prime is 66000659. The next prime is 66000673. The reversal of 66000667 is 76600066.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76600066 = 2 ⋅38300033.

It is a cyclic number.

It is not a de Polignac number, because 66000667 - 2³ = 66000659 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66000967) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 24313 + ... + 26890.

It is an arithmetic number, because the mean of its divisors is an integer number (16513290).

Almost surely, 2^66000667 is an apocalyptic number.

66000667 is a deficient number, since it is larger than the sum of its proper divisors (52493).

66000667 is a wasteful number, since it uses less digits than its factorization.

66000667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52492.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 66000667 is about 8124.0794555445. The cubic root of 66000667 is about 404.1253634249.

The spelling of 66000667 in words is "sixty-six million, six hundred sixty-seven", and thus it is an aban number.