165165663 has 8 divisors (see below), whose sum is σ = 237161008. Its totient is φ = 101640384.

The previous prime is 165165631. The next prime is 165165713. The reversal of 165165663 is 366561561.

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

It is not a de Polignac number, because 165165663 - 2⁵ = 165165631 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 4235017 = 165165663 / (1 + 6 + 5 + 1 + 6 + 5 + 6 + 6 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165165163) 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, 2117470 + ... + 2117547.

It is an arithmetic number, because the mean of its divisors is an integer number (29645126).

Almost surely, 2^165165663 is an apocalyptic number.

165165663 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

165165663 is a deficient number, since it is larger than the sum of its proper divisors (71995345).

165165663 is a wasteful number, since it uses less digits than its factorization.

165165663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4235033.

The product of its digits is 97200, while the sum is 39.

The square root of 165165663 is about 12851.6793844229. The cubic root of 165165663 is about 548.6641553612.

The spelling of 165165663 in words is "one hundred sixty-five million, one hundred sixty-five thousand, six hundred sixty-three".