66497544288 has 288 divisors, whose sum is σ = 229018083840. Its totient is φ = 17878579200.

The previous prime is 66497544283. The next prime is 66497544517. The reversal of 66497544288 is 88244579466.

66497544288 is a `hidden beast` number, since 6 + 6 + 4 + 9 + 7 + 544 + 2 + 88 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66497544283) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5778156 + ... + 5789652.

It is an arithmetic number, because the mean of its divisors is an integer number (795201680).

Almost surely, 2^66497544288 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 66497544288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114509041920).

66497544288 is an abundant number, since it is smaller than the sum of its proper divisors (162520539552).

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

66497544288 is a wasteful number, since it uses less digits than its factorization.

66497544288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11690 (or 11679 counting only the distinct ones).

The product of its digits is 92897280, while the sum is 63.

The spelling of 66497544288 in words is "sixty-six billion, four hundred ninety-seven million, five hundred forty-four thousand, two hundred eighty-eight".