66666509005 has 8 divisors (see below), whose sum is σ = 80088018912. Its totient is φ = 53274401808.

The previous prime is 66666508999. The next prime is 66666509057. The reversal of 66666509005 is 50090566666.

66666509005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 66666509005 - 2¹⁵ = 66666476237 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 66666509005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7345687 + ... + 7354756.

It is an arithmetic number, because the mean of its divisors is an integer number (10011002364).

Almost surely, 2^66666509005 is an apocalyptic number.

It is an amenable number.

66666509005 is a deficient number, since it is larger than the sum of its proper divisors (13421509907).

66666509005 is a wasteful number, since it uses less digits than its factorization.

66666509005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14701355.

The product of its (nonzero) digits is 1749600, while the sum is 49.

The spelling of 66666509005 in words is "sixty-six billion, six hundred sixty-six million, five hundred nine thousand, five".