221415720332166 has 24 divisors (see below), whose sum is σ = 483979494889800. Its totient is φ = 73152096392256.

The previous prime is 221415720332161. The next prime is 221415720332167. The reversal of 221415720332166 is 661233027514122.

221415720332166 is a `hidden beast` number, since 2 + 2 + 1 + 4 + 157 + 2 + 0 + 332 + 166 = 666.

221415720332166 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 not an unprimeable number, because it can be changed into a prime (221415720332161) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54428641116 + ... + 54428645183.

It is an arithmetic number, because the mean of its divisors is an integer number (20165812287075).

Almost surely, 2^{221415720332166} is an apocalyptic number.

221415720332166 is an abundant number, since it is smaller than the sum of its proper divisors (262563774557634).

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

221415720332166 is a wasteful number, since it uses less digits than its factorization.

221415720332166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108857286420 (or 108857286417 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

Adding to 221415720332166 its reverse (661233027514122), we get a palindrome (882648747846288).

The spelling of 221415720332166 in words is "two hundred twenty-one trillion, four hundred fifteen billion, seven hundred twenty million, three hundred thirty-two thousand, one hundred sixty-six".