66638986266 has 8 divisors (see below), whose sum is σ = 133277972544. Its totient is φ = 22212995420.

The previous prime is 66638986259. The next prime is 66638986277. The reversal of 66638986266 is 66268983666.

It is a sphenic number, since it is the product of 3 distinct primes.

66638986266 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 66638986197 and 66638986206.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5553248850 + ... + 5553248861.

It is an arithmetic number, because the mean of its divisors is an integer number (16659746568).

Almost surely, 2^66638986266 is an apocalyptic number.

66638986266 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

66638986266 is a wasteful number, since it uses less digits than its factorization.

66638986266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11106497716.

The product of its digits is 161243136, while the sum is 66.

The spelling of 66638986266 in words is "sixty-six billion, six hundred thirty-eight million, nine hundred eighty-six thousand, two hundred sixty-six".