165404253 has 24 divisors (see below), whose sum is σ = 270052320. Its totient is φ = 89540640.

The previous prime is 165404249. The next prime is 165404257. The reversal of 165404253 is 352404561.

It is an interprime number because it is at equal distance from previous prime (165404249) and next prime (165404257).

It is not a de Polignac number, because 165404253 - 2² = 165404249 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165404253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165404257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26818 + ... + 32403.

It is an arithmetic number, because the mean of its divisors is an integer number (11252180).

Almost surely, 2^165404253 is an apocalyptic number.

It is an amenable number.

165404253 is a deficient number, since it is larger than the sum of its proper divisors (104648067).

165404253 is a wasteful number, since it uses less digits than its factorization.

165404253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59257 (or 59250 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 165404253 is about 12860.9584790559. The cubic root of 165404253 is about 548.9282191214.

The spelling of 165404253 in words is "one hundred sixty-five million, four hundred four thousand, two hundred fifty-three".