165438165228 has 96 divisors (see below), whose sum is σ = 448568440320. Its totient is φ = 46479121920.

The previous prime is 165438165197. The next prime is 165438165391. The reversal of 165438165228 is 822561834561.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1988938 + ... + 2070446.

It is an arithmetic number, because the mean of its divisors is an integer number (4672587920).

Almost surely, 2^165438165228 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165438165228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (224284220160).

165438165228 is an abundant number, since it is smaller than the sum of its proper divisors (283130275092).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165438165228 is a wasteful number, since it uses less digits than its factorization.

165438165228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81927 (or 81925 counting only the distinct ones).

The product of its digits is 2764800, while the sum is 51.

Adding to 165438165228 its reverse (822561834561), we get a palindrome (987999999789).

The spelling of 165438165228 in words is "one hundred sixty-five billion, four hundred thirty-eight million, one hundred sixty-five thousand, two hundred twenty-eight".