208220665 has 8 divisors (see below), whose sum is σ = 251121600. Its totient is φ = 165738672.

The previous prime is 208220651. The next prime is 208220671. The reversal of 208220665 is 566022802.

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

It is a cyclic number.

It is not a de Polignac number, because 208220665 - 2⁹ = 208220153 is a prime.

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, 103639 + ... + 105628.

It is an arithmetic number, because the mean of its divisors is an integer number (31390200).

Almost surely, 2^208220665 is an apocalyptic number.

It is an amenable number.

208220665 is a deficient number, since it is larger than the sum of its proper divisors (42900935).

208220665 is a wasteful number, since it uses less digits than its factorization.

208220665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209471.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 208220665 is about 14429.8532563571. The cubic root of 208220665 is about 592.7086650137.

The spelling of 208220665 in words is "two hundred eight million, two hundred twenty thousand, six hundred sixty-five".