221663115516 has 48 divisors (see below), whose sum is σ = 544476732800. Its totient is φ = 69993605952.

The previous prime is 221663115397. The next prime is 221663115517. The reversal of 221663115516 is 615511366122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221663115517) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3943626 + ... + 3999438.

Almost surely, 2^221663115516 is an apocalyptic number.

It is an amenable number.

221663115516 is an abundant number, since it is smaller than the sum of its proper divisors (322813617284).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221663115516 is a wasteful number, since it uses less digits than its factorization.

221663115516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73258 (or 73256 counting only the distinct ones).

The product of its digits is 64800, while the sum is 39.

The spelling of 221663115516 in words is "two hundred twenty-one billion, six hundred sixty-three million, one hundred fifteen thousand, five hundred sixteen".