161803544724 has 36 divisors (see below), whose sum is σ = 433062430164. Its totient is φ = 50761896192.

The previous prime is 161803544713. The next prime is 161803544729. The reversal of 161803544724 is 427445308161.

161803544724 is a `hidden beast` number, since 1 + 6 + 1 + 80 + 3 + 544 + 7 + 24 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 91482051600 + 70321493124 = 302460^2 + 265182^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 161803544724.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161803544729) 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 11 ways as a sum of consecutive naturals, for example, 132191827 + ... + 132193050.

It is an arithmetic number, because the mean of its divisors is an integer number (12029511949).

Almost surely, 2^161803544724 is an apocalyptic number.

It is an amenable number.

161803544724 is an abundant number, since it is smaller than the sum of its proper divisors (271258885440).

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

161803544724 is a wasteful number, since it uses less digits than its factorization.

161803544724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264384904 (or 264384899 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 45.

The spelling of 161803544724 in words is "one hundred sixty-one billion, eight hundred three million, five hundred forty-four thousand, seven hundred twenty-four".