165421044 has 36 divisors (see below), whose sum is σ = 418802020. Its totient is φ = 55054080.

The previous prime is 165421031. The next prime is 165421063. The reversal of 165421044 is 440124561.

165421044 is a `hidden beast` number, since 1 + 654 + 2 + 1 + 0 + 4 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 95062500 + 70358544 = 9750^2 + 8388^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 165420999 and 165421017.

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 in 11 ways as a sum of consecutive naturals, for example, 22284 + ... + 28764.

Almost surely, 2^165421044 is an apocalyptic number.

It is an amenable number.

165421044 is an abundant number, since it is smaller than the sum of its proper divisors (253380976).

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

165421044 is a wasteful number, since it uses less digits than its factorization.

165421044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7200 (or 7195 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 165421044 is about 12861.6112520944. The cubic root of 165421044 is about 548.9467932948.

The spelling of 165421044 in words is "one hundred sixty-five million, four hundred twenty-one thousand, forty-four".