66006666673 has 8 divisors (see below), whose sum is σ = 66210328800. Its totient is φ = 65803312128.

The previous prime is 66006666623. The next prime is 66006666701. The reversal of 66006666673 is 37666660066.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66006666673 - 2⁹ = 66006666161 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66006666673.

It is not an unprimeable number, because it can be changed into a prime (66006666623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 356718 + ... + 509176.

It is an arithmetic number, because the mean of its divisors is an integer number (8276291100).

Almost surely, 2^66006666673 is an apocalyptic number.

It is an amenable number.

66006666673 is a deficient number, since it is larger than the sum of its proper divisors (203662127).

66006666673 is a wasteful number, since it uses less digits than its factorization.

66006666673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153791.

The product of its (nonzero) digits is 5878656, while the sum is 52.

The spelling of 66006666673 in words is "sixty-six billion, six million, six hundred sixty-six thousand, six hundred seventy-three".