66664006 has 4 divisors (see below), whose sum is σ = 99996012. Its totient is φ = 33332002.

The previous prime is 66663979. The next prime is 66664007. The reversal of 66664006 is 60046666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66664007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16666000 + ... + 16666003.

It is an arithmetic number, because the mean of its divisors is an integer number (24999003).

Almost surely, 2^66664006 is an apocalyptic number.

66664006 is a deficient number, since it is larger than the sum of its proper divisors (33332006).

66664006 is a wasteful number, since it uses less digits than its factorization.

66664006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33332005.

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 66664006 is about 8164.8028757589. The cubic root of 66664006 is about 405.4747387291.

The spelling of 66664006 in words is "sixty-six million, six hundred sixty-four thousand, six".