7668661073581 has 2 divisors, whose sum is σ = 7668661073582. Its totient is φ = 7668661073580.

The previous prime is 7668661073573. The next prime is 7668661073627. The reversal of 7668661073581 is 1853701668667.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7328206328356 + 340454745225 = 2707066^2 + 583485^2 .

It is a cyclic number.

It is not a de Polignac number, because 7668661073581 - 2³ = 7668661073573 is a prime.

It is a super-2 number, since 2×7668661073581² (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 (7668661043581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3834330536790 + 3834330536791.

It is an arithmetic number, because the mean of its divisors is an integer number (3834330536791).

Almost surely, 2^{7668661073581} is an apocalyptic number.

It is an amenable number.

7668661073581 is a deficient number, since it is larger than the sum of its proper divisors (1).

7668661073581 is an equidigital number, since it uses as much as digits as its factorization.

7668661073581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60963840, while the sum is 64.

The spelling of 7668661073581 in words is "seven trillion, six hundred sixty-eight billion, six hundred sixty-one million, seventy-three thousand, five hundred eighty-one".