7865944803641 has 2 divisors, whose sum is σ = 7865944803642. Its totient is φ = 7865944803640.

The previous prime is 7865944803601. The next prime is 7865944803659. The reversal of 7865944803641 is 1463084495687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7719623253241 + 146321550400 = 2778421^2 + 382520^2 .

It is an emirp because it is prime and its reverse (1463084495687) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7865944803641 is a prime.

It is not a weakly prime, because it can be changed into another prime (7865944803601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3932972401820 + 3932972401821.

It is an arithmetic number, because the mean of its divisors is an integer number (3932972401821).

Almost surely, 2^{7865944803641} is an apocalyptic number.

It is an amenable number.

7865944803641 is a deficient number, since it is larger than the sum of its proper divisors (1).

7865944803641 is an equidigital number, since it uses as much as digits as its factorization.

7865944803641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139345920, while the sum is 65.

The spelling of 7865944803641 in words is "seven trillion, eight hundred sixty-five billion, nine hundred forty-four million, eight hundred three thousand, six hundred forty-one".