221205552606 has 48 divisors (see below), whose sum is σ = 504542821536. Its totient is φ = 69905138688.

The previous prime is 221205552599. The next prime is 221205552619. The reversal of 221205552606 is 606255502122.

221205552606 is a `hidden beast` number, since 2 + 2 + 120 + 5 + 5 + 526 + 0 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2317435 + ... + 2410998.

It is an arithmetic number, because the mean of its divisors is an integer number (10511308782).

Almost surely, 2^221205552606 is an apocalyptic number.

221205552606 is an abundant number, since it is smaller than the sum of its proper divisors (283337268930).

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

221205552606 is a wasteful number, since it uses less digits than its factorization.

221205552606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4728577 (or 4728574 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The spelling of 221205552606 in words is "two hundred twenty-one billion, two hundred five million, five hundred fifty-two thousand, six hundred six".