18416851676681 has 2 divisors, whose sum is σ = 18416851676682. Its totient is φ = 18416851676680.

The previous prime is 18416851676659. The next prime is 18416851676719. The reversal of 18416851676681 is 18667615861481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17832377665600 + 584474011081 = 4222840^2 + 764509^2 .

It is a cyclic number.

It is not a de Polignac number, because 18416851676681 - 2¹⁸ = 18416851414537 is a prime.

It is a super-3 number, since 3×18416851676681³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (18416851676381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9208425838340 + 9208425838341.

It is an arithmetic number, because the mean of its divisors is an integer number (9208425838341).

Almost surely, 2^{18416851676681} is an apocalyptic number.

It is an amenable number.

18416851676681 is a deficient number, since it is larger than the sum of its proper divisors (1).

18416851676681 is an equidigital number, since it uses as much as digits as its factorization.

18416851676681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 92897280, while the sum is 68.

The spelling of 18416851676681 in words is "eighteen trillion, four hundred sixteen billion, eight hundred fifty-one million, six hundred seventy-six thousand, six hundred eighty-one".