66772424550 has 96 divisors (see below), whose sum is σ = 179120535552. Its totient is φ = 16363774080.

The previous prime is 66772424533. The next prime is 66772424573. The reversal of 66772424550 is 5542427766.

It is a self number, because there is not a number n which added to its sum of digits gives 66772424550.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 367227 + ... + 518073.

It is an arithmetic number, because the mean of its divisors is an integer number (1865838912).

Almost surely, 2^66772424550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66772424550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89560267776).

66772424550 is an abundant number, since it is smaller than the sum of its proper divisors (112348111002).

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

66772424550 is a wasteful number, since it uses less digits than its factorization.

66772424550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151102 (or 151097 counting only the distinct ones).

The product of its (nonzero) digits is 2822400, while the sum is 48.

The spelling of 66772424550 in words is "sixty-six billion, seven hundred seventy-two million, four hundred twenty-four thousand, five hundred fifty".