2005221655 has 8 divisors (see below), whose sum is σ = 2547811152. Its totient is φ = 1509813888.

The previous prime is 2005221641. The next prime is 2005221703. The reversal of 2005221655 is 5561225002.

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 2005221655 - 2⁷ = 2005221527 is a prime.

It is a Duffinian number.

It is a congruent 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, 11795337 + ... + 11795506.

It is an arithmetic number, because the mean of its divisors is an integer number (318476394).

Almost surely, 2^2005221655 is an apocalyptic number.

2005221655 is a deficient number, since it is larger than the sum of its proper divisors (542589497).

2005221655 is a wasteful number, since it uses less digits than its factorization.

2005221655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23590865.

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 2005221655 is about 44779.7013723852. The cubic root of 2005221655 is about 1261.0165758791.

Adding to 2005221655 its reverse (5561225002), we get a palindrome (7566446657).

The spelling of 2005221655 in words is "two billion, five million, two hundred twenty-one thousand, six hundred fifty-five".