16664123111 has 2 divisors, whose sum is σ = 16664123112. Its totient is φ = 16664123110.

The previous prime is 16664122963. The next prime is 16664123137. The reversal of 16664123111 is 11132146661.

It is a strong prime.

It is an emirp because it is prime and its reverse (11132146661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16664123111 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16664323111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8332061555 + 8332061556.

It is an arithmetic number, because the mean of its divisors is an integer number (8332061556).

Almost surely, 2^16664123111 is an apocalyptic number.

16664123111 is a deficient number, since it is larger than the sum of its proper divisors (1).

16664123111 is an equidigital number, since it uses as much as digits as its factorization.

16664123111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 32.

Adding to 16664123111 its reverse (11132146661), we get a palindrome (27796269772).

The spelling of 16664123111 in words is "sixteen billion, six hundred sixty-four million, one hundred twenty-three thousand, one hundred eleven".