6640665166 has 8 divisors (see below), whose sum is σ = 10304480520. Its totient is φ = 3205838328.

The previous prime is 6640665067. The next prime is 6640665193. The reversal of 6640665166 is 6615660466.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57247056 + ... + 57247171.

It is an arithmetic number, because the mean of its divisors is an integer number (1288060065).

Almost surely, 2^6640665166 is an apocalyptic number.

6640665166 is a deficient number, since it is larger than the sum of its proper divisors (3663815354).

6640665166 is a wasteful number, since it uses less digits than its factorization.

6640665166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114494258.

The product of its (nonzero) digits is 933120, while the sum is 46.

The square root of 6640665166 is about 81490.2765119864. The cubic root of 6640665166 is about 1879.6220348892.

The spelling of 6640665166 in words is "six billion, six hundred forty million, six hundred sixty-five thousand, one hundred sixty-six".