165625643 has 4 divisors (see below), whose sum is σ = 165655080. Its totient is φ = 165596208.

The previous prime is 165625601. The next prime is 165625651. The reversal of 165625643 is 346526561.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 165625643 - 2¹⁰ = 165624619 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165625597 and 165625606.

It is not an unprimeable number, because it can be changed into a prime (165625673) 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 3 ways as a sum of consecutive naturals, for example, 3353 + ... + 18506.

It is an arithmetic number, because the mean of its divisors is an integer number (41413770).

Almost surely, 2^165625643 is an apocalyptic number.

165625643 is a deficient number, since it is larger than the sum of its proper divisors (29437).

165625643 is an equidigital number, since it uses as much as digits as its factorization.

165625643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29436.

The product of its digits is 129600, while the sum is 38.

The square root of 165625643 is about 12869.5626576819. The cubic root of 165625643 is about 549.1730194333.

The spelling of 165625643 in words is "one hundred sixty-five million, six hundred twenty-five thousand, six hundred forty-three".