165825643 has 4 divisors (see below), whose sum is σ = 166252320. Its totient is φ = 165398968.

The previous prime is 165825641. The next prime is 165825659. The reversal of 165825643 is 346528561.

165825643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 165825643 - 2¹ = 165825641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165825596 and 165825605.

It is not an unprimeable number, because it can be changed into a prime (165825641) 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, 212755 + ... + 213532.

It is an arithmetic number, because the mean of its divisors is an integer number (41563080).

Almost surely, 2^165825643 is an apocalyptic number.

165825643 is a deficient number, since it is larger than the sum of its proper divisors (426677).

165825643 is an equidigital number, since it uses as much as digits as its factorization.

165825643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426676.

The product of its digits is 172800, while the sum is 40.

The square root of 165825643 is about 12877.3305851795. The cubic root of 165825643 is about 549.3939804342.

The spelling of 165825643 in words is "one hundred sixty-five million, eight hundred twenty-five thousand, six hundred forty-three".