66716045550 has 576 divisors, whose sum is σ = 234845326080. Its totient is φ = 13771296000.

The previous prime is 66716045507. The next prime is 66716045563. The reversal of 66716045550 is 5554061766.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 66716045496 and 66716045505.

It is a congruent number.

It is an unprimeable number.

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 287 ways as a sum of consecutive naturals, for example, 201558885 + ... + 201559215.

It is an arithmetic number, because the mean of its divisors is an integer number (407717580).

Almost surely, 2^66716045550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66716045550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117422663040).

66716045550 is an abundant number, since it is smaller than the sum of its proper divisors (168129280530).

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

66716045550 is a wasteful number, since it uses less digits than its factorization.

66716045550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654 (or 636 counting only the distinct ones).

The product of its (nonzero) digits is 756000, while the sum is 45.

The spelling of 66716045550 in words is "sixty-six billion, seven hundred sixteen million, forty-five thousand, five hundred fifty".