16881661429 has 2 divisors, whose sum is σ = 16881661430. Its totient is φ = 16881661428.

The previous prime is 16881661427. The next prime is 16881661457. The reversal of 16881661429 is 92416618861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10022012100 + 6859649329 = 100110^2 + 82823^2 .

It is a cyclic number.

It is not a de Polignac number, because 16881661429 - 2¹ = 16881661427 is a prime.

It is a super-3 number, since 3×16881661429³ (a number of 32 digits) contains 333 as substring.

Together with 16881661427, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16881661427) 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 as a sum of consecutive naturals, namely, 8440830714 + 8440830715.

It is an arithmetic number, because the mean of its divisors is an integer number (8440830715).

Almost surely, 2^16881661429 is an apocalyptic number.

It is an amenable number.

16881661429 is a deficient number, since it is larger than the sum of its proper divisors (1).

16881661429 is an equidigital number, since it uses as much as digits as its factorization.

16881661429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 995328, while the sum is 52.

The spelling of 16881661429 in words is "sixteen billion, eight hundred eighty-one million, six hundred sixty-one thousand, four hundred twenty-nine".