220651531855 has 16 divisors (see below), whose sum is σ = 274993608960. Its totient is φ = 169820589312.

The previous prime is 220651531829. The next prime is 220651531871. The reversal of 220651531855 is 558135156022.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 220651531855 - 2¹¹ = 220651529807 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6684159 + ... + 6717088.

It is an arithmetic number, because the mean of its divisors is an integer number (17187100560).

Almost surely, 2^220651531855 is an apocalyptic number.

220651531855 is a deficient number, since it is larger than the sum of its proper divisors (54342077105).

220651531855 is a wasteful number, since it uses less digits than its factorization.

220651531855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13401378.

The product of its (nonzero) digits is 360000, while the sum is 43.

Adding to 220651531855 its reverse (558135156022), we get a palindrome (778786687877).

The spelling of 220651531855 in words is "two hundred twenty billion, six hundred fifty-one million, five hundred thirty-one thousand, eight hundred fifty-five".