1665116165 has 8 divisors (see below), whose sum is σ = 2085015168. Its totient is φ = 1274175760.

The previous prime is 1665116161. The next prime is 1665116251. The reversal of 1665116165 is 5616115661.

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

It is not a de Polignac number, because 1665116165 - 2² = 1665116161 is a prime.

It is a super-2 number, since 2×1665116165² = 5545223685888614450, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665116161) 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, 7239521 + ... + 7239750.

It is an arithmetic number, because the mean of its divisors is an integer number (260626896).

Almost surely, 2^1665116165 is an apocalyptic number.

It is an amenable number.

1665116165 is a deficient number, since it is larger than the sum of its proper divisors (419899003).

1665116165 is a wasteful number, since it uses less digits than its factorization.

1665116165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14479299.

The product of its digits is 32400, while the sum is 38.

The square root of 1665116165 is about 40805.8349381556. The cubic root of 1665116165 is about 1185.2633228250.

The spelling of 1665116165 in words is "one billion, six hundred sixty-five million, one hundred sixteen thousand, one hundred sixty-five".