16661326411 has 2 divisors, whose sum is σ = 16661326412. Its totient is φ = 16661326410.

The previous prime is 16661326393. The next prime is 16661326421. The reversal of 16661326411 is 11462316661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16661326411 - 2⁵ = 16661326379 is a prime.

It is a super-2 number, since 2×16661326411² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16661326421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8330663205 + 8330663206.

It is an arithmetic number, because the mean of its divisors is an integer number (8330663206).

Almost surely, 2^16661326411 is an apocalyptic number.

16661326411 is a deficient number, since it is larger than the sum of its proper divisors (1).

16661326411 is an equidigital number, since it uses as much as digits as its factorization.

16661326411 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 37.

The spelling of 16661326411 in words is "sixteen billion, six hundred sixty-one million, three hundred twenty-six thousand, four hundred eleven".