666770165 has 16 divisors (see below), whose sum is σ = 826922496. Its totient is φ = 515592000.

The previous prime is 666770129. The next prime is 666770171. The reversal of 666770165 is 561077666.

It is not a de Polignac number, because 666770165 - 2¹⁰ = 666769141 is a prime.

It is a Duffinian number.

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 15 ways as a sum of consecutive naturals, for example, 160859 + ... + 164951.

It is an arithmetic number, because the mean of its divisors is an integer number (51682656).

Almost surely, 2^666770165 is an apocalyptic number.

It is an amenable number.

666770165 is a deficient number, since it is larger than the sum of its proper divisors (160152331).

666770165 is a wasteful number, since it uses less digits than its factorization.

666770165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5180.

The product of its (nonzero) digits is 317520, while the sum is 44.

The square root of 666770165 is about 25821.8931335408. The cubic root of 666770165 is about 873.6256694581.

The spelling of 666770165 in words is "six hundred sixty-six million, seven hundred seventy thousand, one hundred sixty-five".