221165566622 has 64 divisors (see below), whose sum is σ = 446146444800. Its totient is φ = 79411121280.

The previous prime is 221165566619. The next prime is 221165566637. The reversal of 221165566622 is 226665561122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1150004 + ... + 1328472.

It is an arithmetic number, because the mean of its divisors is an integer number (6971038200).

Almost surely, 2^221165566622 is an apocalyptic number.

221165566622 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

221165566622 is an abundant number, since it is smaller than the sum of its proper divisors (224980878178).

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

221165566622 is a wasteful number, since it uses less digits than its factorization.

221165566622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179121.

The product of its digits is 518400, while the sum is 44.

It can be divided in two parts, 221165 and 566622, that added together give a palindrome (787787).

The spelling of 221165566622 in words is "two hundred twenty-one billion, one hundred sixty-five million, five hundred sixty-six thousand, six hundred twenty-two".