220616454156561 has 6 divisors (see below), whose sum is σ = 318668211559490. Its totient is φ = 147077636104368.

The previous prime is 220616454156509. The next prime is 220616454156569. The reversal of 220616454156561 is 165651454616022.

It is a happy number.

220616454156561 is a `hidden beast` number, since 2 + 2 + 0 + 6 + 1 + 64 + 5 + 4 + 15 + 6 + 561 = 666.

It can be written as a sum of positive squares in only one way, i.e., 127578854796561 + 93037599360000 = 11295081^2 + 9645600^2 .

It is not a de Polignac number, because 220616454156561 - 2¹¹ = 220616454154513 is a prime.

It is a super-2 number, since 2×220616454156561² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220616454156498 and 220616454156507.

It is not an unprimeable number, because it can be changed into a prime (220616454156569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12256469675356 + ... + 12256469675373.

Almost surely, 2^{220616454156561} is an apocalyptic number.

It is an amenable number.

220616454156561 is a deficient number, since it is larger than the sum of its proper divisors (98051757402929).

220616454156561 is a wasteful number, since it uses less digits than its factorization.

220616454156561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24512939350735 (or 24512939350732 counting only the distinct ones).

The product of its (nonzero) digits is 10368000, while the sum is 54.

The spelling of 220616454156561 in words is "two hundred twenty trillion, six hundred sixteen billion, four hundred fifty-four million, one hundred fifty-six thousand, five hundred sixty-one".