165023556 has 48 divisors (see below), whose sum is σ = 415425024. Its totient is φ = 50791936.

The previous prime is 165023549. The next prime is 165023557. The reversal of 165023556 is 655320561.

165023556 = T₉₆ + T₉₇ + ... + T₉₉₆.

It is not an unprimeable number, because it can be changed into a prime (165023557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3181 + ... + 18443.

It is an arithmetic number, because the mean of its divisors is an integer number (8654688).

Almost surely, 2^165023556 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 165023556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (207712512).

165023556 is an abundant number, since it is smaller than the sum of its proper divisors (250401468).

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

165023556 is a wasteful number, since it uses less digits than its factorization.

165023556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15340 (or 15338 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 33.

The square root of 165023556 is about 12846.1494619983. The cubic root of 165023556 is about 548.5067550322.

The spelling of 165023556 in words is "one hundred sixty-five million, twenty-three thousand, five hundred fifty-six".