1666657383271 has 8 divisors (see below), whose sum is σ = 1686773423664. Its totient is φ = 1646542196160.

The previous prime is 1666657383233. The next prime is 1666657383323. The reversal of 1666657383271 is 1723837566661.

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

It is a cyclic number.

It is not a de Polignac number, because 1666657383271 - 2⁹ = 1666657382759 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 (1666657353271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4285785 + ... + 4658461.

It is an arithmetic number, because the mean of its divisors is an integer number (210846677958).

Almost surely, 2^{1666657383271} is an apocalyptic number.

1666657383271 is a deficient number, since it is larger than the sum of its proper divisors (20116040393).

1666657383271 is an equidigital number, since it uses as much as digits as its factorization.

1666657383271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426641.

The product of its digits is 45722880, while the sum is 61.

The spelling of 1666657383271 in words is "one trillion, six hundred sixty-six billion, six hundred fifty-seven million, three hundred eighty-three thousand, two hundred seventy-one".