16661657222123 has 2 divisors, whose sum is σ = 16661657222124. Its totient is φ = 16661657222122.

The previous prime is 16661657222071. The next prime is 16661657222179. The reversal of 16661657222123 is 32122275616661.

It is a weak prime.

It is an emirp because it is prime and its reverse (32122275616661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16661657222123 - 2¹⁶ = 16661657156587 is a prime.

It is a super-2 number, since 2×16661657222123² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16661657225123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8330828611061 + 8330828611062.

It is an arithmetic number, because the mean of its divisors is an integer number (8330828611062).

Almost surely, 2^{16661657222123} is an apocalyptic number.

16661657222123 is a deficient number, since it is larger than the sum of its proper divisors (1).

16661657222123 is an equidigital number, since it uses as much as digits as its factorization.

16661657222123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2177280, while the sum is 50.

The spelling of 16661657222123 in words is "sixteen trillion, six hundred sixty-one billion, six hundred fifty-seven million, two hundred twenty-two thousand, one hundred twenty-three".