2166366522222 has 72 divisors (see below), whose sum is σ = 5460592565376. Its totient is φ = 618909185664.

The previous prime is 2166366522149. The next prime is 2166366522227. The reversal of 2166366522222 is 2222256636612.

It is a happy number.

2166366522222 is a `hidden beast` number, since 2 + 1 + 6 + 63 + 66 + 522 + 2 + 2 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166366522227) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 10924083 + ... + 11120625.

It is an arithmetic number, because the mean of its divisors is an integer number (75841563408).

Almost surely, 2^{2166366522222} is an apocalyptic number.

2166366522222 is an abundant number, since it is smaller than the sum of its proper divisors (3294226043154).

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

2166366522222 is a wasteful number, since it uses less digits than its factorization.

2166366522222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209062 (or 209052 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 45.

The spelling of 2166366522222 in words is "two trillion, one hundred sixty-six billion, three hundred sixty-six million, five hundred twenty-two thousand, two hundred twenty-two".