66165811448 has 96 divisors (see below), whose sum is σ = 137740705200. Its totient is φ = 29773201920.

The previous prime is 66165811423. The next prime is 66165811463. The reversal of 66165811448 is 84411856166.

It is a junction number, because it is equal to n+sod(n) for n = 66165811396 and 66165811405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 83018186 + ... + 83018982.

Almost surely, 2^66165811448 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 66165811448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68870352600).

66165811448 is an abundant number, since it is smaller than the sum of its proper divisors (71574893752).

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

66165811448 is a wasteful number, since it uses less digits than its factorization.

66165811448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1581 (or 1566 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 50.

The spelling of 66165811448 in words is "sixty-six billion, one hundred sixty-five million, eight hundred eleven thousand, four hundred forty-eight".