2166111211507 has 4 divisors (see below), whose sum is σ = 2166116122456. Its totient is φ = 2166106300560.

The previous prime is 2166111211493. The next prime is 2166111211531. The reversal of 2166111211507 is 7051121116612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2166111211507 - 2³¹ = 2163963727859 is a prime.

It is a super-2 number, since 2×2166111211507² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2166111211597) 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 3 ways as a sum of consecutive naturals, for example, 1720533 + ... + 2700454.

It is an arithmetic number, because the mean of its divisors is an integer number (541529030614).

Almost surely, 2^{2166111211507} is an apocalyptic number.

2166111211507 is a deficient number, since it is larger than the sum of its proper divisors (4910949).

2166111211507 is an equidigital number, since it uses as much as digits as its factorization.

2166111211507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4910948.

The product of its (nonzero) digits is 5040, while the sum is 34.

The spelling of 2166111211507 in words is "two trillion, one hundred sixty-six billion, one hundred eleven million, two hundred eleven thousand, five hundred seven".