66645470011 has 4 divisors (see below), whose sum is σ = 66710112624. Its totient is φ = 66580827400.

The previous prime is 66645470009. The next prime is 66645470041. The reversal of 66645470011 is 11007454666.

66645470011 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 is a cyclic number.

It is not a de Polignac number, because 66645470011 - 2¹ = 66645470009 is a prime.

It is a Smith number, since the sum of its digits (40) 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 (66645470041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32319760 + ... + 32321821.

It is an arithmetic number, because the mean of its divisors is an integer number (16677528156).

Almost surely, 2^66645470011 is an apocalyptic number.

66645470011 is a deficient number, since it is larger than the sum of its proper divisors (64642613).

66645470011 is a wasteful number, since it uses less digits than its factorization.

66645470011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64642612.

The product of its (nonzero) digits is 120960, while the sum is 40.

The spelling of 66645470011 in words is "sixty-six billion, six hundred forty-five million, four hundred seventy thousand, eleven".