165680443 has 2 divisors, whose sum is σ = 165680444. Its totient is φ = 165680442.

The previous prime is 165680441. The next prime is 165680479. The reversal of 165680443 is 344086561.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165680443 - 2¹ = 165680441 is a prime.

Together with 165680441, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (165680441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82840221 + 82840222.

It is an arithmetic number, because the mean of its divisors is an integer number (82840222).

Almost surely, 2^165680443 is an apocalyptic number.

165680443 is a deficient number, since it is larger than the sum of its proper divisors (1).

165680443 is an equidigital number, since it uses as much as digits as its factorization.

165680443 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 37.

The square root of 165680443 is about 12871.6915360803. The cubic root of 165680443 is about 549.2335804319.

The spelling of 165680443 in words is "one hundred sixty-five million, six hundred eighty thousand, four hundred forty-three".