66866979180 has 96 divisors (see below), whose sum is σ = 189271857600. Its totient is φ = 17637437440.

The previous prime is 66866979139. The next prime is 66866979209. The reversal of 66866979180 is 8197966866.

It is a Smith number, since the sum of its digits (66) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 2295346 + ... + 2324294.

It is an arithmetic number, because the mean of its divisors is an integer number (1971581850).

Almost surely, 2^66866979180 is an apocalyptic number.

66866979180 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 66866979180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94635928800).

66866979180 is an abundant number, since it is smaller than the sum of its proper divisors (122404878420).

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

66866979180 is a wasteful number, since it uses less digits than its factorization.

66866979180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29379 (or 29377 counting only the distinct ones).

The product of its (nonzero) digits is 47029248, while the sum is 66.

The spelling of 66866979180 in words is "sixty-six billion, eight hundred sixty-six million, nine hundred seventy-nine thousand, one hundred eighty".