666788889000 has 384 divisors, whose sum is σ = 2315143434240. Its totient is φ = 158829120000.

The previous prime is 666788888999. The next prime is 666788889017. The reversal of 666788889000 is 988887666.

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, 37470105 + ... + 37487895.

It is an arithmetic number, because the mean of its divisors is an integer number (6029019360).

Almost surely, 2^666788889000 is an apocalyptic number.

666788889000 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 666788889000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1157571717120).

666788889000 is an abundant number, since it is smaller than the sum of its proper divisors (1648354545240).

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

666788889000 is a wasteful number, since it uses less digits than its factorization.

666788889000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17890 (or 17845 counting only the distinct ones).

The product of its (nonzero) digits is 55738368, while the sum is 66.

The spelling of 666788889000 in words is "six hundred sixty-six billion, seven hundred eighty-eight million, eight hundred eighty-nine thousand".