16672224729581 has 2 divisors, whose sum is σ = 16672224729582. Its totient is φ = 16672224729580.

The previous prime is 16672224729553. The next prime is 16672224729619. The reversal of 16672224729581 is 18592742227661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9825152940100 + 6847071789481 = 3134510^2 + 2616691^2 .

It is a cyclic number.

It is not a de Polignac number, because 16672224729581 - 2¹⁴ = 16672224713197 is a prime.

It is a super-2 number, since 2×16672224729581² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16672224722581) 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, 8336112364790 + 8336112364791.

It is an arithmetic number, because the mean of its divisors is an integer number (8336112364791).

Almost surely, 2^{16672224729581} is an apocalyptic number.

It is an amenable number.

16672224729581 is a deficient number, since it is larger than the sum of its proper divisors (1).

16672224729581 is an equidigital number, since it uses as much as digits as its factorization.

16672224729581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40642560, while the sum is 62.

The spelling of 16672224729581 in words is "sixteen trillion, six hundred seventy-two billion, two hundred twenty-four million, seven hundred twenty-nine thousand, five hundred eighty-one".