165641326 has 4 divisors (see below), whose sum is σ = 248461992. Its totient is φ = 82820662.

The previous prime is 165641321. The next prime is 165641327. The reversal of 165641326 is 623146561.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 165641291 and 165641300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165641321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41410330 + ... + 41410333.

It is an arithmetic number, because the mean of its divisors is an integer number (62115498).

Almost surely, 2^165641326 is an apocalyptic number.

165641326 is a deficient number, since it is larger than the sum of its proper divisors (82820666).

165641326 is an equidigital number, since it uses as much as digits as its factorization.

165641326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82820665.

The product of its digits is 25920, while the sum is 34.

The square root of 165641326 is about 12870.1719491233. The cubic root of 165641326 is about 549.1903525155.

Adding to 165641326 its reverse (623146561), we get a palindrome (788787887).

The spelling of 165641326 in words is "one hundred sixty-five million, six hundred forty-one thousand, three hundred twenty-six".