165810369 has 16 divisors (see below), whose sum is σ = 223743168. Its totient is φ = 109217472.

The previous prime is 165810319. The next prime is 165810373. The reversal of 165810369 is 963018561.

It is not a de Polignac number, because 165810369 - 2¹³ = 165802177 is a prime.

It is a super-3 number, since 3×165810369³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (165810319) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91894 + ... + 93680.

It is an arithmetic number, because the mean of its divisors is an integer number (13983948).

Almost surely, 2^165810369 is an apocalyptic number.

It is an amenable number.

165810369 is a deficient number, since it is larger than the sum of its proper divisors (57932799).

165810369 is a wasteful number, since it uses less digits than its factorization.

165810369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2144.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 165810369 is about 12876.7375138270. The cubic root of 165810369 is about 549.3771119106.

The spelling of 165810369 in words is "one hundred sixty-five million, eight hundred ten thousand, three hundred sixty-nine".