16425247213681 has 2 divisors, whose sum is σ = 16425247213682. Its totient is φ = 16425247213680.

The previous prime is 16425247213679. The next prime is 16425247213757. The reversal of 16425247213681 is 18631274252461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15829894542400 + 595352671281 = 3978680^2 + 771591^2 .

It is a cyclic number.

It is not a de Polignac number, because 16425247213681 - 2¹ = 16425247213679 is a prime.

It is a super-2 number, since 2×16425247213681² (a number of 27 digits) contains 22 as substring.

Together with 16425247213679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (16425247213601) 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, 8212623606840 + 8212623606841.

It is an arithmetic number, because the mean of its divisors is an integer number (8212623606841).

Almost surely, 2^{16425247213681} is an apocalyptic number.

It is an amenable number.

16425247213681 is a deficient number, since it is larger than the sum of its proper divisors (1).

16425247213681 is an equidigital number, since it uses as much as digits as its factorization.

16425247213681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3870720, while the sum is 52.

The spelling of 16425247213681 in words is "sixteen trillion, four hundred twenty-five billion, two hundred forty-seven million, two hundred thirteen thousand, six hundred eighty-one".