66489659136 has 288 divisors, whose sum is σ = 207817568000. Its totient is φ = 20910845952.

The previous prime is 66489659129. The next prime is 66489659141. The reversal of 66489659136 is 63195698466.

66489659136 is a `hidden beast` number, since 6 + 6 + 4 + 8 + 9 + 6 + 591 + 36 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37164930 + ... + 37166718.

Almost surely, 2^66489659136 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 66489659136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103908784000).

66489659136 is an abundant number, since it is smaller than the sum of its proper divisors (141327908864).

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

66489659136 is a wasteful number, since it uses less digits than its factorization.

66489659136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2116 (or 2096 counting only the distinct ones).

The product of its digits is 50388480, while the sum is 63.

The spelling of 66489659136 in words is "sixty-six billion, four hundred eighty-nine million, six hundred fifty-nine thousand, one hundred thirty-six".