165544427 has 2 divisors, whose sum is σ = 165544428. Its totient is φ = 165544426.

The previous prime is 165544417. The next prime is 165544447. The reversal of 165544427 is 724445561.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165544427 - 2¹⁰ = 165543403 is a prime.

It is equal to p_9267644 and since 165544427 and 9267644 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (165544417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82772213 + 82772214.

It is an arithmetic number, because the mean of its divisors is an integer number (82772214).

Almost surely, 2^165544427 is an apocalyptic number.

165544427 is a deficient number, since it is larger than the sum of its proper divisors (1).

165544427 is an equidigital number, since it uses as much as digits as its factorization.

165544427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 134400, while the sum is 38.

The square root of 165544427 is about 12866.4069187944. The cubic root of 165544427 is about 549.0832408069.

Adding to 165544427 its reverse (724445561), we get a palindrome (889989988).

The spelling of 165544427 in words is "one hundred sixty-five million, five hundred forty-four thousand, four hundred twenty-seven".