165881012 has 24 divisors (see below), whose sum is σ = 321414240. Its totient is φ = 74273760.

The previous prime is 165881011. The next prime is 165881029. The reversal of 165881012 is 210188561.

It is a self number, because there is not a number n which added to its sum of digits gives 165881012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165881011) 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 7 ways as a sum of consecutive naturals, for example, 25187 + ... + 31082.

It is an arithmetic number, because the mean of its divisors is an integer number (13392260).

Almost surely, 2^165881012 is an apocalyptic number.

It is an amenable number.

165881012 is a deficient number, since it is larger than the sum of its proper divisors (155533228).

165881012 is a wasteful number, since it uses less digits than its factorization.

165881012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56351 (or 56349 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 32.

The square root of 165881012 is about 12879.4802690171. The cubic root of 165881012 is about 549.4551209786.

The spelling of 165881012 in words is "one hundred sixty-five million, eight hundred eighty-one thousand, twelve".