80847665666 has 8 divisors (see below), whose sum is σ = 121941507324. Its totient is φ = 40200496560.

The previous prime is 80847665621. The next prime is 80847665669. The reversal of 80847665666 is 66656674808.

It can be written as a sum of positive squares in 2 ways, for example, as 62722698025 + 18124967641 = 250445^2 + 134629^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 80847665599 and 80847665608.

It is not an unprimeable number, because it can be changed into a prime (80847665669) 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 3 ways as a sum of consecutive naturals, for example, 111667685 + ... + 111668408.

Almost surely, 2^80847665666 is an apocalyptic number.

80847665666 is a deficient number, since it is larger than the sum of its proper divisors (41093841658).

80847665666 is a wasteful number, since it uses less digits than its factorization.

80847665666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223336276.

The product of its (nonzero) digits is 69672960, while the sum is 62.

The spelling of 80847665666 in words is "eighty billion, eight hundred forty-seven million, six hundred sixty-five thousand, six hundred sixty-six".