165215126 has 4 divisors (see below), whose sum is σ = 247822692. Its totient is φ = 82607562.

The previous prime is 165215119. The next prime is 165215161. The reversal of 165215126 is 621512561.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 621512561 = 8219 ⋅75619.

It is a congruent number.

It is an unprimeable number.

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, 41303780 + ... + 41303783.

It is an arithmetic number, because the mean of its divisors is an integer number (61955673).

Almost surely, 2^165215126 is an apocalyptic number.

165215126 is a deficient number, since it is larger than the sum of its proper divisors (82607566).

165215126 is an equidigital number, since it uses as much as digits as its factorization.

165215126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82607565.

The product of its digits is 3600, while the sum is 29.

The square root of 165215126 is about 12853.6036192190. The cubic root of 165215126 is about 548.7189203085.

Adding to 165215126 its reverse (621512561), we get a palindrome (786727687).

The spelling of 165215126 in words is "one hundred sixty-five million, two hundred fifteen thousand, one hundred twenty-six".