16681986533 has 2 divisors, whose sum is σ = 16681986534. Its totient is φ = 16681986532.

The previous prime is 16681986527. The next prime is 16681986553. The reversal of 16681986533 is 33568918661.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16573472644 + 108513889 = 128738^2 + 10417^2 .

It is a cyclic number.

It is not a de Polignac number, because 16681986533 - 2⁶ = 16681986469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16681986523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8340993266 + 8340993267.

It is an arithmetic number, because the mean of its divisors is an integer number (8340993267).

Almost surely, 2^16681986533 is an apocalyptic number.

It is an amenable number.

16681986533 is a deficient number, since it is larger than the sum of its proper divisors (1).

16681986533 is an equidigital number, since it uses as much as digits as its factorization.

16681986533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5598720, while the sum is 56.

It can be divided in two parts, 166819 and 86533, that added together give a palindrome (253352).

The spelling of 16681986533 in words is "sixteen billion, six hundred eighty-one million, nine hundred eighty-six thousand, five hundred thirty-three".