165666335 has 4 divisors (see below), whose sum is σ = 198799608. Its totient is φ = 132533064.

The previous prime is 165666331. The next prime is 165666341. The reversal of 165666335 is 533666561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 533666561 = 4721 ⋅113041.

It is a cyclic number.

It is not a de Polignac number, because 165666335 - 2² = 165666331 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165666292 and 165666301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165666331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16566629 + ... + 16566638.

It is an arithmetic number, because the mean of its divisors is an integer number (49699902).

Almost surely, 2^165666335 is an apocalyptic number.

165666335 is a deficient number, since it is larger than the sum of its proper divisors (33133273).

165666335 is an equidigital number, since it uses as much as digits as its factorization.

165666335 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33133272.

The product of its digits is 291600, while the sum is 41.

The square root of 165666335 is about 12871.1435000935. The cubic root of 165666335 is about 549.2179905667.

The spelling of 165666335 in words is "one hundred sixty-five million, six hundred sixty-six thousand, three hundred thirty-five".