165581330 has 16 divisors (see below), whose sum is σ = 300395520. Its totient is φ = 65710512.

The previous prime is 165581303. The next prime is 165581359. The reversal of 165581330 is 33185561.

165581330 = 460² + 461² + ... + 840².

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 7 ways as a sum of consecutive naturals, for example, 63920 + ... + 66459.

It is an arithmetic number, because the mean of its divisors is an integer number (18774720).

Almost surely, 2^165581330 is an apocalyptic number.

165581330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165581330 is a deficient number, since it is larger than the sum of its proper divisors (134814190).

165581330 is a wasteful number, since it uses less digits than its factorization.

165581330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130513.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 165581330 is about 12867.8409222371. The cubic root of 165581330 is about 549.1240381399.

The spelling of 165581330 in words is "one hundred sixty-five million, five hundred eighty-one thousand, three hundred thirty".