220520366666 has 16 divisors (see below), whose sum is σ = 331630345800. Its totient is φ = 109977020160.

The previous prime is 220520366639. The next prime is 220520366683. The reversal of 220520366666 is 666663025022.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 166729305625 + 53791061041 = 408325^2 + 231929^2 .

It is a super-2 number, since 2×220520366666² (a number of 23 digits) contains 22 as substring.

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, 4902470 + ... + 4947246.

Almost surely, 2^220520366666 is an apocalyptic number.

220520366666 is a deficient number, since it is larger than the sum of its proper divisors (111109979134).

220520366666 is a wasteful number, since it uses less digits than its factorization.

220520366666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51049.

The product of its (nonzero) digits is 933120, while the sum is 44.

The spelling of 220520366666 in words is "two hundred twenty billion, five hundred twenty million, three hundred sixty-six thousand, six hundred sixty-six".