165285953 has 4 divisors (see below), whose sum is σ = 188898240. Its totient is φ = 141673668.

The previous prime is 165285949. The next prime is 165285977. The reversal of 165285953 is 359582561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 165285953 - 2² = 165285949 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (165285983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11806133 + ... + 11806146.

It is an arithmetic number, because the mean of its divisors is an integer number (47224560).

Almost surely, 2^165285953 is an apocalyptic number.

It is an amenable number.

165285953 is a deficient number, since it is larger than the sum of its proper divisors (23612287).

165285953 is an equidigital number, since it uses as much as digits as its factorization.

165285953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23612286.

The product of its digits is 324000, while the sum is 44.

The square root of 165285953 is about 12856.3584657554. The cubic root of 165285953 is about 548.7973202379.

The spelling of 165285953 in words is "one hundred sixty-five million, two hundred eighty-five thousand, nine hundred fifty-three".