65993908439808 has 180 divisors, whose sum is σ = 196791010611888. Its totient is φ = 21996950353920.

The previous prime is 65993908439801. The next prime is 65993908439821. The reversal of 65993908439808 is 80893480939956.

65993908439808 is a `hidden beast` number, since 6 + 5 + 9 + 93 + 90 + 8 + 439 + 8 + 0 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is not an unprimeable number, because it can be changed into a prime (65993908439801) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 544528978 + ... + 544650158.

Almost surely, 2^{65993908439808} 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 65993908439808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98395505305944).

65993908439808 is an abundant number, since it is smaller than the sum of its proper divisors (130797102172080).

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

65993908439808 is a wasteful number, since it uses less digits than its factorization.

65993908439808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147472 (or 147449 counting only the distinct ones).

The product of its (nonzero) digits is 3627970560, while the sum is 81.

The spelling of 65993908439808 in words is "sixty-five trillion, nine hundred ninety-three billion, nine hundred eight million, four hundred thirty-nine thousand, eight hundred eight".