66536039808 has 768 divisors, whose sum is σ = 244408320000. Its totient is φ = 16937496576.

The previous prime is 66536039767. The next prime is 66536039813. The reversal of 66536039808 is 80893063566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 278393353 + ... + 278393591.

It is an arithmetic number, because the mean of its divisors is an integer number (318240000).

Almost surely, 2^66536039808 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 66536039808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122204160000).

66536039808 is an abundant number, since it is smaller than the sum of its proper divisors (177872280192).

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

66536039808 is a wasteful number, since it uses less digits than its factorization.

66536039808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387 (or 372 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 54.

The spelling of 66536039808 in words is "sixty-six billion, five hundred thirty-six million, thirty-nine thousand, eight hundred eight".