66666771000 has 192 divisors, whose sum is σ = 232603488000. Its totient is φ = 17204256000.

The previous prime is 66666770981. The next prime is 66666771001. The reversal of 66666771000 is 17766666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66666771001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 159526 + ... + 398474.

It is an arithmetic number, because the mean of its divisors is an integer number (1211476500).

Almost surely, 2^66666771000 is an apocalyptic number.

66666771000 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 66666771000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116301744000).

66666771000 is an abundant number, since it is smaller than the sum of its proper divisors (165936717000).

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

66666771000 is a wasteful number, since it uses less digits than its factorization.

66666771000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239007 (or 238990 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 45.

The spelling of 66666771000 in words is "sixty-six billion, six hundred sixty-six million, seven hundred seventy-one thousand".