2166211621167 has 16 divisors (see below), whose sum is σ = 3217892700672. Its totient is φ = 1284922430720.

The previous prime is 2166211621157. The next prime is 2166211621219. The reversal of 2166211621167 is 7611261126612.

It is a cyclic number.

It is not a de Polignac number, because 2166211621167 - 2²³ = 2166203232559 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166211621157) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 698325858 + ... + 698328959.

It is an arithmetic number, because the mean of its divisors is an integer number (201118293792).

Almost surely, 2^{2166211621167} is an apocalyptic number.

2166211621167 is a deficient number, since it is larger than the sum of its proper divisors (1051681079505).

2166211621167 is a wasteful number, since it uses less digits than its factorization.

2166211621167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1396654878.

The product of its digits is 72576, while the sum is 42.

Adding to 2166211621167 its reverse (7611261126612), we get a palindrome (9777472747779).

The spelling of 2166211621167 in words is "two trillion, one hundred sixty-six billion, two hundred eleven million, six hundred twenty-one thousand, one hundred sixty-seven".