66075386673 has 4 divisors (see below), whose sum is σ = 88100515568. Its totient is φ = 44050257780.

The previous prime is 66075386669. The next prime is 66075386717. The reversal of 66075386673 is 37668357066.

66075386673 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 66075386673 - 2² = 66075386669 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66075386653) 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, 11012564443 + ... + 11012564448.

It is an arithmetic number, because the mean of its divisors is an integer number (22025128892).

Almost surely, 2^66075386673 is an apocalyptic number.

It is an amenable number.

66075386673 is a deficient number, since it is larger than the sum of its proper divisors (22025128895).

66075386673 is a wasteful number, since it uses less digits than its factorization.

66075386673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22025128894.

The product of its (nonzero) digits is 22861440, while the sum is 57.

The spelling of 66075386673 in words is "sixty-six billion, seventy-five million, three hundred eighty-six thousand, six hundred seventy-three".