165881064 has 64 divisors (see below), whose sum is σ = 427910400. Its totient is φ = 53547264.

The previous prime is 165881047. The next prime is 165881081. The reversal of 165881064 is 460188561.

It is an interprime number because it is at equal distance from previous prime (165881047) and next prime (165881081).

It is an unprimeable number.

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, 325642 + ... + 326150.

It is an arithmetic number, because the mean of its divisors is an integer number (6686100).

Almost surely, 2^165881064 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 165881064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (213955200).

165881064 is an abundant number, since it is smaller than the sum of its proper divisors (262029336).

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

165881064 is a wasteful number, since it uses less digits than its factorization.

165881064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 922 (or 918 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 165881064 is about 12879.4822877319. The cubic root of 165881064 is about 549.4551783926.

The spelling of 165881064 in words is "one hundred sixty-five million, eight hundred eighty-one thousand, sixty-four".