161728277812 has 24 divisors (see below), whose sum is σ = 285681793320. Its totient is φ = 80105224320.

The previous prime is 161728277807. The next prime is 161728277827. The reversal of 161728277812 is 218772827161.

It is a happy number.

161728277812 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 41961064336 + 119767213476 = 204844^2 + 346074^2 .

It is a hoax number, since the sum of its digits (52) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 161728277812.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2152218 + ... + 2226094.

It is an arithmetic number, because the mean of its divisors is an integer number (11903408055).

Almost surely, 2^161728277812 is an apocalyptic number.

It is an amenable number.

161728277812 is a deficient number, since it is larger than the sum of its proper divisors (123953515508).

161728277812 is a wasteful number, since it uses less digits than its factorization.

161728277812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79011 (or 79009 counting only the distinct ones).

The product of its digits is 1053696, while the sum is 52.

The spelling of 161728277812 in words is "one hundred sixty-one billion, seven hundred twenty-eight million, two hundred seventy-seven thousand, eight hundred twelve".