6664567871 has 8 divisors (see below), whose sum is σ = 7294887264. Its totient is φ = 6051057120.

The previous prime is 6664567859. The next prime is 6664567907. The reversal of 6664567871 is 1787654666.

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 6664567871 - 2¹⁰ = 6664566847 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 (6664567831) 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, 4201331 + ... + 4202916.

It is an arithmetic number, because the mean of its divisors is an integer number (911860908).

Almost surely, 2^6664567871 is an apocalyptic number.

6664567871 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

6664567871 is a deficient number, since it is larger than the sum of its proper divisors (630319393).

6664567871 is a wasteful number, since it uses less digits than its factorization.

6664567871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8404321.

The product of its digits is 10160640, while the sum is 56.

The square root of 6664567871 is about 81636.8046349194. The cubic root of 6664567871 is about 1881.8745327984.

The spelling of 6664567871 in words is "six billion, six hundred sixty-four million, five hundred sixty-seven thousand, eight hundred seventy-one".