17221666705 has 8 divisors (see below), whose sum is σ = 21004787304. Its totient is φ = 13551475200.

The previous prime is 17221666663. The next prime is 17221666729. The reversal of 17221666705 is 50766612271.

It can be written as a sum of positive squares in 4 ways, for example, as 657204496 + 16564462209 = 25636^2 + 128703^2 .

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

It is not a de Polignac number, because 17221666705 - 2¹⁵ = 17221633937 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28231936 + ... + 28232545.

It is an arithmetic number, because the mean of its divisors is an integer number (2625598413).

Almost surely, 2^17221666705 is an apocalyptic number.

It is an amenable number.

17221666705 is a deficient number, since it is larger than the sum of its proper divisors (3783120599).

17221666705 is an equidigital number, since it uses as much as digits as its factorization.

17221666705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56464547.

The product of its (nonzero) digits is 211680, while the sum is 43.

The spelling of 17221666705 in words is "seventeen billion, two hundred twenty-one million, six hundred sixty-six thousand, seven hundred five".