221766565332 has 96 divisors (see below), whose sum is σ = 575579683840. Its totient is φ = 65995223040.

The previous prime is 221766565313. The next prime is 221766565373. The reversal of 221766565332 is 233565667122.

221766565332 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 8638788 + ... + 8664420.

Almost surely, 2^221766565332 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221766565332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (287789841920).

221766565332 is an abundant number, since it is smaller than the sum of its proper divisors (353813118508).

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

221766565332 is a wasteful number, since it uses less digits than its factorization.

221766565332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27473 (or 27471 counting only the distinct ones).

The product of its digits is 2721600, while the sum is 48.

The spelling of 221766565332 in words is "two hundred twenty-one billion, seven hundred sixty-six million, five hundred sixty-five thousand, three hundred thirty-two".