180561205044 has 216 divisors, whose sum is σ = 512866658304. Its totient is φ = 53508470400.

The previous prime is 180561205043. The next prime is 180561205067. The reversal of 180561205044 is 440502165081.

It is a happy number.

180561205044 is a `hidden beast` number, since 1 + 8 + 0 + 561 + 2 + 0 + 50 + 44 = 666.

It is a super-2 number, since 2×180561205044² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (180561205043) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 39275754 + ... + 39280350.

Almost surely, 2^180561205044 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 180561205044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (256433329152).

180561205044 is an abundant number, since it is smaller than the sum of its proper divisors (332305453260).

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

180561205044 is a wasteful number, since it uses less digits than its factorization.

180561205044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4827 (or 4811 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The spelling of 180561205044 in words is "one hundred eighty billion, five hundred sixty-one million, two hundred five thousand, forty-four".