165165616605 has 32 divisors (see below), whose sum is σ = 291528305280. Its totient is φ = 79180513280.

The previous prime is 165165616541. The next prime is 165165616643. The reversal of 165165616605 is 506616561561.

It is not a de Polignac number, because 165165616605 - 2⁶ = 165165616541 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5608932 + ... + 5638301.

It is an arithmetic number, because the mean of its divisors is an integer number (9110259540).

Almost surely, 2^165165616605 is an apocalyptic number.

165165616605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165165616605 is a deficient number, since it is larger than the sum of its proper divisors (126362688675).

165165616605 is a wasteful number, since it uses less digits than its factorization.

165165616605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11247341.

The product of its (nonzero) digits is 972000, while the sum is 48.

The spelling of 165165616605 in words is "one hundred sixty-five billion, one hundred sixty-five million, six hundred sixteen thousand, six hundred five".