666105165 has 24 divisors (see below), whose sum is σ = 1259545248. Its totient is φ = 322959840.

The previous prime is 666105157. The next prime is 666105227. The reversal of 666105165 is 561501666.

It is not a de Polignac number, because 666105165 - 2³ = 666105157 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 672339 + ... + 673328.

It is an arithmetic number, because the mean of its divisors is an integer number (52481052).

Almost surely, 2^666105165 is an apocalyptic number.

It is an amenable number.

666105165 is a deficient number, since it is larger than the sum of its proper divisors (593440083).

666105165 is a wasteful number, since it uses less digits than its factorization.

666105165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1345689 (or 1345686 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 666105165 is about 25809.0132511880. The cubic root of 666105165 is about 873.3351374041.

The spelling of 666105165 in words is "six hundred sixty-six million, one hundred five thousand, one hundred sixty-five".