66680530205 has 4 divisors (see below), whose sum is σ = 80016636252. Its totient is φ = 53344424160.

The previous prime is 66680530181. The next prime is 66680530219. The reversal of 66680530205 is 50203508666.

66680530205 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 can be written as a sum of positive squares in 2 ways, for example, as 40890097369 + 25790432836 = 202213^2 + 160594^2 .

It is a de Polignac number, because none of the positive numbers 2^k-66680530205 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6668053016 + ... + 6668053025.

It is an arithmetic number, because the mean of its divisors is an integer number (20004159063).

Almost surely, 2^66680530205 is an apocalyptic number.

It is an amenable number.

66680530205 is a deficient number, since it is larger than the sum of its proper divisors (13336106047).

66680530205 is a wasteful number, since it uses less digits than its factorization.

66680530205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13336106046.

The product of its (nonzero) digits is 259200, while the sum is 41.

The spelling of 66680530205 in words is "sixty-six billion, six hundred eighty million, five hundred thirty thousand, two hundred five".