165904373 has 4 divisors (see below), whose sum is σ = 165933900. Its totient is φ = 165874848.

The previous prime is 165904357. The next prime is 165904381. The reversal of 165904373 is 373409561.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 110208004 + 55696369 = 10498^2 + 7463^2 .

It is a cyclic number.

It is not a de Polignac number, because 165904373 - 2⁴ = 165904357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165904393) 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, 3440 + ... + 18537.

It is an arithmetic number, because the mean of its divisors is an integer number (41483475).

Almost surely, 2^165904373 is an apocalyptic number.

It is an amenable number.

165904373 is a deficient number, since it is larger than the sum of its proper divisors (29527).

165904373 is an equidigital number, since it uses as much as digits as its factorization.

165904373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29526.

The product of its (nonzero) digits is 68040, while the sum is 38.

The square root of 165904373 is about 12880.3871448028. The cubic root of 165904373 is about 549.4809129975.

The spelling of 165904373 in words is "one hundred sixty-five million, nine hundred four thousand, three hundred seventy-three".