2211666223156 has 24 divisors (see below), whose sum is σ = 4280792631080. Its totient is φ = 993180673152.

The previous prime is 2211666223147. The next prime is 2211666223157. The reversal of 2211666223156 is 6513226661122.

It can be written as a sum of positive squares in 4 ways, for example, as 7284622500 + 2204381600656 = 85350^2 + 1484716^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2211666223157) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 574755411 + ... + 574759258.

Almost surely, 2^{2211666223156} is an apocalyptic number.

2211666223156 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

2211666223156 is a deficient number, since it is larger than the sum of its proper divisors (2069126407924).

2211666223156 is a wasteful number, since it uses less digits than its factorization.

2211666223156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1149514723 (or 1149514721 counting only the distinct ones).

The product of its digits is 311040, while the sum is 43.

The spelling of 2211666223156 in words is "two trillion, two hundred eleven billion, six hundred sixty-six million, two hundred twenty-three thousand, one hundred fifty-six".