66266544205 has 4 divisors (see below), whose sum is σ = 79519853052. Its totient is φ = 53013235360.

The previous prime is 66266544191. The next prime is 66266544241. The reversal of 66266544205 is 50244566266.

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 8361822249 + 57904721956 = 91443^2 + 240634^2 .

It is not a de Polignac number, because 66266544205 - 2⁵ = 66266544173 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, 6626654416 + ... + 6626654425.

It is an arithmetic number, because the mean of its divisors is an integer number (19879963263).

Almost surely, 2^66266544205 is an apocalyptic number.

It is an amenable number.

66266544205 is a deficient number, since it is larger than the sum of its proper divisors (13253308847).

66266544205 is a wasteful number, since it uses less digits than its factorization.

66266544205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13253308846.

The product of its (nonzero) digits is 2073600, while the sum is 46.

The spelling of 66266544205 in words is "sixty-six billion, two hundred sixty-six million, five hundred forty-four thousand, two hundred five".