666020446307571 has 8 divisors (see below), whose sum is σ = 888031943795344. Its totient is φ = 444011289845760.

The previous prime is 666020446307563. The next prime is 666020446307653. The reversal of 666020446307571 is 175703644020666.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 666020446307571 - 2³ = 666020446307563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666020446309571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 584592550 + ... + 585730731.

It is an arithmetic number, because the mean of its divisors is an integer number (111003992974418).

Almost surely, 2^{666020446307571} is an apocalyptic number.

666020446307571 is a deficient number, since it is larger than the sum of its proper divisors (222011497487773).

666020446307571 is a wasteful number, since it uses less digits than its factorization.

666020446307571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1170512981.

The product of its (nonzero) digits is 30481920, while the sum is 57.

The spelling of 666020446307571 in words is "six hundred sixty-six trillion, twenty billion, four hundred forty-six million, three hundred seven thousand, five hundred seventy-one".