165544128 has 56 divisors (see below), whose sum is σ = 486674160. Its totient is φ = 55180800.

The previous prime is 165544091. The next prime is 165544139. The reversal of 165544128 is 821445561.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 165544092 and 165544101.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46173 + ... + 49628.

It is an arithmetic number, because the mean of its divisors is an integer number (8690610).

Almost surely, 2^165544128 is an apocalyptic number.

165544128 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

165544128 is an abundant number, since it is smaller than the sum of its proper divisors (321130032).

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

165544128 is an equidigital number, since it uses as much as digits as its factorization.

165544128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95822 (or 95806 counting only the distinct ones).

The product of its digits is 38400, while the sum is 36.

The square root of 165544128 is about 12866.3952993836. The cubic root of 165544128 is about 549.0829102290.

Adding to 165544128 its reverse (821445561), we get a palindrome (986989689).

The spelling of 165544128 in words is "one hundred sixty-five million, five hundred forty-four thousand, one hundred twenty-eight".