66559868928 has 510 divisors, whose sum is σ = 229089039504. Its totient is φ = 18612486144.

The previous prime is 66559868927. The next prime is 66559868929. The reversal of 66559868928 is 82986895566.

66559868928 is a `hidden beast` number, since 6 + 6 + 5 + 598 + 6 + 8 + 9 + 28 = 666.

It is an interprime number because it is at equal distance from previous prime (66559868927) and next prime (66559868929).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66559868927) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 1416167401 + ... + 1416167447.

Almost surely, 2^66559868928 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 66559868928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114544519752).

66559868928 is an abundant number, since it is smaller than the sum of its proper divisors (162529170576).

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

66559868928 is an frugal number, since it uses more digits than its factorization.

66559868928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113 (or 59 counting only the distinct ones).

The product of its digits is 447897600, while the sum is 72.

The spelling of 66559868928 in words is "sixty-six billion, five hundred fifty-nine million, eight hundred sixty-eight thousand, nine hundred twenty-eight".