66605650110 has 64 divisors (see below), whose sum is σ = 177891759360. Its totient is φ = 17733837600.

The previous prime is 66605650081. The next prime is 66605650213. The reversal of 66605650110 is 1105650666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18216 + ... + 365435.

It is an arithmetic number, because the mean of its divisors is an integer number (2779558740).

Almost surely, 2^66605650110 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66605650110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88945879680).

66605650110 is an abundant number, since it is smaller than the sum of its proper divisors (111286109250).

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

66605650110 is a wasteful number, since it uses less digits than its factorization.

66605650110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384310 (or 384304 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The spelling of 66605650110 in words is "sixty-six billion, six hundred five million, six hundred fifty thousand, one hundred ten".