165805005 has 8 divisors (see below), whose sum is σ = 265288032. Its totient is φ = 88429328.

The previous prime is 165804983. The next prime is 165805007. The reversal of 165805005 is 500508561.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 165805005 - 2⁶ = 165804941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165805007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5526819 + ... + 5526848.

It is an arithmetic number, because the mean of its divisors is an integer number (33161004).

Almost surely, 2^165805005 is an apocalyptic number.

165805005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165805005 is a deficient number, since it is larger than the sum of its proper divisors (99483027).

165805005 is a wasteful number, since it uses less digits than its factorization.

165805005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11053675.

The product of its (nonzero) digits is 6000, while the sum is 30.

The square root of 165805005 is about 12876.5292295711. The cubic root of 165805005 is about 549.3711876920.

The spelling of 165805005 in words is "one hundred sixty-five million, eight hundred five thousand, five".