2166686836855 has 16 divisors (see below), whose sum is σ = 2649009938400. Its totient is φ = 1700972633728.

The previous prime is 2166686836793. The next prime is 2166686836859. The reversal of 2166686836855 is 5586386866612.

It is a cyclic number.

It is not a de Polignac number, because 2166686836855 - 2²³ = 2166678448247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166686836859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17458072 + ... + 17581741.

It is an arithmetic number, because the mean of its divisors is an integer number (165563121150).

Almost surely, 2^{2166686836855} is an apocalyptic number.

2166686836855 is a deficient number, since it is larger than the sum of its proper divisors (482323101545).

2166686836855 is a wasteful number, since it uses less digits than its factorization.

2166686836855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35040050.

The product of its digits is 597196800, while the sum is 70.

The spelling of 2166686836855 in words is "two trillion, one hundred sixty-six billion, six hundred eighty-six million, eight hundred thirty-six thousand, eight hundred fifty-five".