66710551171 has 4 divisors (see below), whose sum is σ = 72775146744. Its totient is φ = 60645955600.

The previous prime is 66710551129. The next prime is 66710551189. The reversal of 66710551171 is 17115501766.

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 66710551171 - 2¹⁹ = 66710026883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66710551771) 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, 3032297770 + ... + 3032297791.

It is an arithmetic number, because the mean of its divisors is an integer number (18193786686).

Almost surely, 2^66710551171 is an apocalyptic number.

66710551171 is a deficient number, since it is larger than the sum of its proper divisors (6064595573).

66710551171 is a wasteful number, since it uses less digits than its factorization.

66710551171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6064595572.

The product of its (nonzero) digits is 44100, while the sum is 40.

The spelling of 66710551171 in words is "sixty-six billion, seven hundred ten million, five hundred fifty-one thousand, one hundred seventy-one".