165571560 has 384 divisors, whose sum is σ = 697132800. Its totient is φ = 34214400.

The previous prime is 165571541. The next prime is 165571561. The reversal of 165571560 is 65175561.

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

It is not an unprimeable number, because it can be changed into a prime (165571561) by changing a digit.

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 95 ways as a sum of consecutive naturals, for example, 914670 + ... + 914850.

It is an arithmetic number, because the mean of its divisors is an integer number (1815450).

Almost surely, 2^165571560 is an apocalyptic number.

165571560 is a gapful number since it is divisible by the number (10) 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 165571560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (348566400).

165571560 is an abundant number, since it is smaller than the sum of its proper divisors (531561240).

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

165571560 is a wasteful number, since it uses less digits than its factorization.

165571560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230 (or 209 counting only the distinct ones).

The product of its (nonzero) digits is 31500, while the sum is 36.

The square root of 165571560 is about 12867.4612880708. The cubic root of 165571560 is about 549.1132377126.

The spelling of 165571560 in words is "one hundred sixty-five million, five hundred seventy-one thousand, five hundred sixty".