66660576271 has 4 divisors (see below), whose sum is σ = 67409571600. Its totient is φ = 65911580944.

The previous prime is 66660576247. The next prime is 66660576293. The reversal of 66660576271 is 17267506666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17267506666 = 2 ⋅8633753333.

It is a cyclic number.

It is not a de Polignac number, because 66660576271 - 2²⁷ = 66526358543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66660570271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 374497531 + ... + 374497708.

It is an arithmetic number, because the mean of its divisors is an integer number (16852392900).

Almost surely, 2^66660576271 is an apocalyptic number.

66660576271 is a deficient number, since it is larger than the sum of its proper divisors (748995329).

66660576271 is an equidigital number, since it uses as much as digits as its factorization.

66660576271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748995328.

The product of its (nonzero) digits is 3810240, while the sum is 52.

The spelling of 66660576271 in words is "sixty-six billion, six hundred sixty million, five hundred seventy-six thousand, two hundred seventy-one".