7681443641 has 2 divisors, whose sum is σ = 7681443642. Its totient is φ = 7681443640.

The previous prime is 7681443631. The next prime is 7681443691. The reversal of 7681443641 is 1463441867.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7680769600 + 674041 = 87640^2 + 821^2 .

It is a cyclic number.

It is not a de Polignac number, because 7681443641 - 2³⁰ = 6607701817 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7681443592 and 7681443601.

It is not a weakly prime, because it can be changed into another prime (7681443631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3840721820 + 3840721821.

It is an arithmetic number, because the mean of its divisors is an integer number (3840721821).

Almost surely, 2^7681443641 is an apocalyptic number.

It is an amenable number.

7681443641 is a deficient number, since it is larger than the sum of its proper divisors (1).

7681443641 is an equidigital number, since it uses as much as digits as its factorization.

7681443641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 387072, while the sum is 44.

The square root of 7681443641 is about 87643.8454256772. The cubic root of 7681443641 is about 1973.0932741104.

The spelling of 7681443641 in words is "seven billion, six hundred eighty-one million, four hundred forty-three thousand, six hundred forty-one".