66818598000 has 320 divisors, whose sum is σ = 268581381120. Its totient is φ = 13884288000.

The previous prime is 66818597999. The next prime is 66818598019. The reversal of 66818598000 is 89581866.

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 389686 + ... + 534314.

It is an arithmetic number, because the mean of its divisors is an integer number (839316816).

Almost surely, 2^66818598000 is an apocalyptic number.

66818598000 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66818598000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134290690560).

66818598000 is an abundant number, since it is smaller than the sum of its proper divisors (201762783120).

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

66818598000 is a wasteful number, since it uses less digits than its factorization.

66818598000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144673 (or 144657 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 51.

The spelling of 66818598000 in words is "sixty-six billion, eight hundred eighteen million, five hundred ninety-eight thousand".