180561336904728 has 48 divisors (see below), whose sum is σ = 526637232641520. Its totient is φ = 55557334431936.

The previous prime is 180561336904661. The next prime is 180561336904747. The reversal of 180561336904728 is 827409633165081.

180561336904728 is a `hidden beast` number, since 1 + 8 + 0 + 5 + 613 + 3 + 6 + 9 + 0 + 4 + 7 + 2 + 8 = 666.

It is a super-2 number, since 2×180561336904728² (a number of 29 digits) contains 22 as substring.

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 11 ways as a sum of consecutive naturals, for example, 96453704676 + ... + 96453706547.

It is an arithmetic number, because the mean of its divisors is an integer number (10971609013365).

It is a 2-persistent number, because it is pandigital, and so is 2⋅180561336904728 = 361122673809456, but 3⋅180561336904728 = 541684010714184 is not.

Almost surely, 2^{180561336904728} is an apocalyptic number.

180561336904728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

180561336904728 is an abundant number, since it is smaller than the sum of its proper divisors (346075895736792).

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

180561336904728 is a wasteful number, since it uses less digits than its factorization.

180561336904728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192907411248 (or 192907411241 counting only the distinct ones).

The product of its (nonzero) digits is 52254720, while the sum is 63.

The spelling of 180561336904728 in words is "one hundred eighty trillion, five hundred sixty-one billion, three hundred thirty-six million, nine hundred four thousand, seven hundred twenty-eight".