2166223213156 has 12 divisors (see below), whose sum is σ = 3883351370220. Its totient is φ = 1056694250240.

The previous prime is 2166223213123. The next prime is 2166223213163. The reversal of 2166223213156 is 6513123226612.

It can be written as a sum of positive squares in 2 ways, for example, as 1072086293056 + 1094136920100 = 1035416^2 + 1046010^2 .

It is a super-2 number, since 2×2166223213156² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6604338901 + ... + 6604339228.

It is an arithmetic number, because the mean of its divisors is an integer number (323612614185).

Almost surely, 2^{2166223213156} is an apocalyptic number.

It is an amenable number.

2166223213156 is a deficient number, since it is larger than the sum of its proper divisors (1717128157064).

2166223213156 is a wasteful number, since it uses less digits than its factorization.

2166223213156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13208678174 (or 13208678172 counting only the distinct ones).

The product of its digits is 155520, while the sum is 40.

Adding to 2166223213156 its reverse (6513123226612), we get a palindrome (8679346439768).

The spelling of 2166223213156 in words is "two trillion, one hundred sixty-six billion, two hundred twenty-three million, two hundred thirteen thousand, one hundred fifty-six".