165838457 has 4 divisors (see below), whose sum is σ = 166244340. Its totient is φ = 165432576.

The previous prime is 165838447. The next prime is 165838469. The reversal of 165838457 is 754838561.

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 124634896 + 41203561 = 11164^2 + 6419^2 .

It is a cyclic number.

It is not a de Polignac number, because 165838457 - 2¹⁰ = 165837433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165838447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202328 + ... + 203145.

It is an arithmetic number, because the mean of its divisors is an integer number (41561085).

Almost surely, 2^165838457 is an apocalyptic number.

It is an amenable number.

165838457 is a deficient number, since it is larger than the sum of its proper divisors (405883).

165838457 is an equidigital number, since it uses as much as digits as its factorization.

165838457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405882.

The product of its digits is 806400, while the sum is 47.

The square root of 165838457 is about 12877.8281165731. The cubic root of 165838457 is about 549.4081313480.

The spelling of 165838457 in words is "one hundred sixty-five million, eight hundred thirty-eight thousand, four hundred fifty-seven".