165535872 has 32 divisors (see below), whose sum is σ = 439705680. Its totient is φ = 55178496.

The previous prime is 165535837. The next prime is 165535873. The reversal of 165535872 is 278535561.

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (165535873) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215158 + ... + 215925.

Almost surely, 2^165535872 is an apocalyptic number.

165535872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

165535872 is an abundant number, since it is smaller than the sum of its proper divisors (274169808).

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

165535872 is an equidigital number, since it uses as much as digits as its factorization.

165535872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431100 (or 431088 counting only the distinct ones).

The product of its digits is 252000, while the sum is 42.

The square root of 165535872 is about 12866.0744596011. The cubic root of 165535872 is about 549.0737821415.

The spelling of 165535872 in words is "one hundred sixty-five million, five hundred thirty-five thousand, eight hundred seventy-two".