6664170865 has 16 divisors (see below), whose sum is σ = 9183165120. Its totient is φ = 4591581120.

The previous prime is 6664170859. The next prime is 6664170893. The reversal of 6664170865 is 5680714666.

It is not a de Polignac number, because 6664170865 - 2⁹ = 6664170353 is a prime.

It is a super-2 number, since 2×6664170865² = 88822346635829696450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3187554 + ... + 3189643.

It is an arithmetic number, because the mean of its divisors is an integer number (573947820).

Almost surely, 2^6664170865 is an apocalyptic number.

It is an amenable number.

6664170865 is a deficient number, since it is larger than the sum of its proper divisors (2518994255).

6664170865 is a wasteful number, since it uses less digits than its factorization.

6664170865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6377232.

The product of its (nonzero) digits is 1451520, while the sum is 49.

The square root of 6664170865 is about 81634.3730606171. The cubic root of 6664170865 is about 1881.8371645183.

The spelling of 6664170865 in words is "six billion, six hundred sixty-four million, one hundred seventy thousand, eight hundred sixty-five".