66445514544 has 160 divisors (see below), whose sum is σ = 179882486784. Its totient is φ = 21118371840.

The previous prime is 66445514521. The next prime is 66445514561. The reversal of 66445514544 is 44541554466.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 66445514493 and 66445514502.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13666674 + ... + 13671534.

Almost surely, 2^66445514544 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 66445514544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89941243392).

66445514544 is an abundant number, since it is smaller than the sum of its proper divisors (113436972240).

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

66445514544 is a wasteful number, since it uses less digits than its factorization.

66445514544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5075 (or 5069 counting only the distinct ones).

The product of its digits is 4608000, while the sum is 48.

The spelling of 66445514544 in words is "sixty-six billion, four hundred forty-five million, five hundred fourteen thousand, five hundred forty-four".