6661100111 has 4 divisors (see below), whose sum is σ = 6661834824. Its totient is φ = 6660365400.

The previous prime is 6661100093. The next prime is 6661100113. The reversal of 6661100111 is 1110011666.

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 6661100111 - 2¹⁴ = 6661083727 is a prime.

It is a Duffinian number.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6661100113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 353585 + ... + 371946.

It is an arithmetic number, because the mean of its divisors is an integer number (1665458706).

Almost surely, 2^6661100111 is an apocalyptic number.

6661100111 is a deficient number, since it is larger than the sum of its proper divisors (734713).

6661100111 is an equidigital number, since it uses as much as digits as its factorization.

6661100111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 734712.

The product of its (nonzero) digits is 216, while the sum is 23.

The square root of 6661100111 is about 81615.5629215409. The cubic root of 6661100111 is about 1881.5480789532.

Adding to 6661100111 its reverse (1110011666), we get a palindrome (7771111777).

The spelling of 6661100111 in words is "six billion, six hundred sixty-one million, one hundred thousand, one hundred eleven".