165887849 has 2 divisors, whose sum is σ = 165887850. Its totient is φ = 165887848.

The previous prime is 165887837. The next prime is 165887857. The reversal of 165887849 is 948788561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118374400 + 47513449 = 10880^2 + 6893^2 .

It is a cyclic number.

It is not a de Polignac number, because 165887849 - 2¹⁶ = 165822313 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 165887794 and 165887803.

It is not a weakly prime, because it can be changed into another prime (165887899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82943924 + 82943925.

It is an arithmetic number, because the mean of its divisors is an integer number (82943925).

Almost surely, 2^165887849 is an apocalyptic number.

It is an amenable number.

165887849 is a deficient number, since it is larger than the sum of its proper divisors (1).

165887849 is an equidigital number, since it uses as much as digits as its factorization.

165887849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3870720, while the sum is 56.

The square root of 165887849 is about 12879.7456884831. The cubic root of 165887849 is about 549.4626697089.

The spelling of 165887849 in words is "one hundred sixty-five million, eight hundred eighty-seven thousand, eight hundred forty-nine".