16672224722581 has 2 divisors, whose sum is σ = 16672224722582. Its totient is φ = 16672224722580.

The previous prime is 16672224722477. The next prime is 16672224722611. The reversal of 16672224722581 is 18522742227661.

16672224722581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12354311116900 + 4317913605681 = 3514870^2 + 2077959^2 .

It is a cyclic number.

It is not a de Polignac number, because 16672224722581 - 2⁷ = 16672224722453 is a prime.

It is a super-2 number, since 2×16672224722581² (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 (16672224722081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8336112361290 + 8336112361291.

It is an arithmetic number, because the mean of its divisors is an integer number (8336112361291).

Almost surely, 2^{16672224722581} is an apocalyptic number.

It is an amenable number.

16672224722581 is a deficient number, since it is larger than the sum of its proper divisors (1).

16672224722581 is an equidigital number, since it uses as much as digits as its factorization.

16672224722581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9031680, while the sum is 55.

The spelling of 16672224722581 in words is "sixteen trillion, six hundred seventy-two billion, two hundred twenty-four million, seven hundred twenty-two thousand, five hundred eighty-one".