66505546044 has 120 divisors (see below), whose sum is σ = 200213236608. Its totient is φ = 18856450080.

The previous prime is 66505546007. The next prime is 66505546057. The reversal of 66505546044 is 44064550566.

66505546044 is a `hidden beast` number, since 6 + 6 + 50 + 554 + 6 + 0 + 44 = 666.

66505546044 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×66505546044² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 185187 + ... + 409029.

Almost surely, 2^66505546044 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 66505546044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100106618304).

66505546044 is an abundant number, since it is smaller than the sum of its proper divisors (133707690564).

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

66505546044 is a wasteful number, since it uses less digits than its factorization.

66505546044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223997 (or 223986 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 45.

The spelling of 66505546044 in words is "sixty-six billion, five hundred five million, five hundred forty-six thousand, forty-four".