66610278888 has 96 divisors (see below), whose sum is σ = 175945556160. Its totient is φ = 21011604480.

The previous prime is 66610278887. The next prime is 66610278929. The reversal of 66610278888 is 88887201666.

It is not an unprimeable number, because it can be changed into a prime (66610278887) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8928856 + ... + 8936312.

It is an arithmetic number, because the mean of its divisors is an integer number (1832766210).

Almost surely, 2^66610278888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66610278888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87972778080).

66610278888 is an abundant number, since it is smaller than the sum of its proper divisors (109335277272).

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

66610278888 is a wasteful number, since it uses less digits than its factorization.

66610278888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8535 (or 8512 counting only the distinct ones).

The product of its (nonzero) digits is 12386304, while the sum is 60.

The spelling of 66610278888 in words is "sixty-six billion, six hundred ten million, two hundred seventy-eight thousand, eight hundred eighty-eight".