165666116575 has 6 divisors (see below), whose sum is σ = 205425984584. Its totient is φ = 132532893240.

The previous prime is 165666116521. The next prime is 165666116617. The reversal of 165666116575 is 575611666561.

It is not a de Polignac number, because 165666116575 - 2²⁵ = 165632562143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3313322307 + ... + 3313322356.

Almost surely, 2^165666116575 is an apocalyptic number.

165666116575 is a deficient number, since it is larger than the sum of its proper divisors (39759868009).

165666116575 is an equidigital number, since it uses as much as digits as its factorization.

165666116575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6626644673 (or 6626644668 counting only the distinct ones).

The product of its digits is 6804000, while the sum is 55.

The spelling of 165666116575 in words is "one hundred sixty-five billion, six hundred sixty-six million, one hundred sixteen thousand, five hundred seventy-five".