16667025772081 has 2 divisors, whose sum is σ = 16667025772082. Its totient is φ = 16667025772080.

The previous prime is 16667025772013. The next prime is 16667025772169. The reversal of 16667025772081 is 18027752076661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14884480357681 + 1782545414400 = 3858041^2 + 1335120^2 .

It is a cyclic number.

It is not a de Polignac number, because 16667025772081 - 2⁷ = 16667025771953 is a prime.

It is a super-2 number, since 2×16667025772081² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16667025772781) 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, 8333512886040 + 8333512886041.

It is an arithmetic number, because the mean of its divisors is an integer number (8333512886041).

Almost surely, 2^{16667025772081} is an apocalyptic number.

It is an amenable number.

16667025772081 is a deficient number, since it is larger than the sum of its proper divisors (1).

16667025772081 is an equidigital number, since it uses as much as digits as its factorization.

16667025772081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11854080, while the sum is 58.

The spelling of 16667025772081 in words is "sixteen trillion, six hundred sixty-seven billion, twenty-five million, seven hundred seventy-two thousand, eighty-one".