165719969 has 2 divisors, whose sum is σ = 165719970. Its totient is φ = 165719968.

The previous prime is 165719867. The next prime is 165719977. The reversal of 165719969 is 969917561.

It is a happy number.

165719969 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154057744 + 11662225 = 12412^2 + 3415^2 .

It is a cyclic number.

It is not a de Polignac number, because 165719969 - 2⁸ = 165719713 is a prime.

It is a super-2 number, since 2×165719969² = 54926216250721922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 165719969.

It is not a weakly prime, because it can be changed into another prime (165719999) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82859984 + 82859985.

It is an arithmetic number, because the mean of its divisors is an integer number (82859985).

Almost surely, 2^165719969 is an apocalyptic number.

It is an amenable number.

165719969 is a deficient number, since it is larger than the sum of its proper divisors (1).

165719969 is an equidigital number, since it uses as much as digits as its factorization.

165719969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 918540, while the sum is 53.

The square root of 165719969 is about 12873.2268293540. The cubic root of 165719969 is about 549.2772534206.

The spelling of 165719969 in words is "one hundred sixty-five million, seven hundred nineteen thousand, nine hundred sixty-nine".