165524172 has 72 divisors (see below), whose sum is σ = 447679680. Its totient is φ = 47197440.

The previous prime is 165524167. The next prime is 165524173. The reversal of 165524172 is 271425561.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (165524173) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35979 + ... + 40317.

Almost surely, 2^165524172 is an apocalyptic number.

165524172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165524172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (223839840).

165524172 is an abundant number, since it is smaller than the sum of its proper divisors (282155508).

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

165524172 is a wasteful number, since it uses less digits than its factorization.

165524172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4391 (or 4372 counting only the distinct ones).

The product of its digits is 16800, while the sum is 33.

The square root of 165524172 is about 12865.6197674267. The cubic root of 165524172 is about 549.0608457418.

The spelling of 165524172 in words is "one hundred sixty-five million, five hundred twenty-four thousand, one hundred seventy-two".