66099888000 has 512 divisors, whose sum is σ = 246604176000. Its totient is φ = 17617305600.

The previous prime is 66099887989. The next prime is 66099888013. The reversal of 66099888000 is 88899066.

It is a super-2 number, since 2×66099888000² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 34991056 + ... + 34992944.

Almost surely, 2^66099888000 is an apocalyptic number.

66099888000 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 66099888000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123302088000).

66099888000 is an abundant number, since it is smaller than the sum of its proper divisors (180504288000).

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

66099888000 is an frugal number, since it uses more digits than its factorization.

66099888000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1939 (or 1899 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 54.

The spelling of 66099888000 in words is "sixty-six billion, ninety-nine million, eight hundred eighty-eight thousand".