165720833 has 2 divisors, whose sum is σ = 165720834. Its totient is φ = 165720832.

The previous prime is 165720829. The next prime is 165720853. The reversal of 165720833 is 338027561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 153561664 + 12159169 = 12392^2 + 3487^2 .

It is a cyclic number.

It is not a de Polignac number, because 165720833 - 2² = 165720829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165720793 and 165720802.

It is not a weakly prime, because it can be changed into another prime (165720853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82860416 + 82860417.

It is an arithmetic number, because the mean of its divisors is an integer number (82860417).

Almost surely, 2^165720833 is an apocalyptic number.

It is an amenable number.

165720833 is a deficient number, since it is larger than the sum of its proper divisors (1).

165720833 is an equidigital number, since it uses as much as digits as its factorization.

165720833 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 165720833 is about 12873.2603873300. The cubic root of 165720833 is about 549.2782079922.

The spelling of 165720833 in words is "one hundred sixty-five million, seven hundred twenty thousand, eight hundred thirty-three".