7865944803601 has 2 divisors, whose sum is σ = 7865944803602. Its totient is φ = 7865944803600.

The previous prime is 7865944803599. The next prime is 7865944803641. The reversal of 7865944803601 is 1063084495687.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7314044393601 + 551900410000 = 2704449^2 + 742900^2 .

It is an emirp because it is prime and its reverse (1063084495687) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7865944803601 - 2¹ = 7865944803599 is a prime.

Together with 7865944803599, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 7865944803601.

It is not a weakly prime, because it can be changed into another prime (7865944803641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3932972401800 + 3932972401801.

It is an arithmetic number, because the mean of its divisors is an integer number (3932972401801).

Almost surely, 2^{7865944803601} is an apocalyptic number.

It is an amenable number.

7865944803601 is a deficient number, since it is larger than the sum of its proper divisors (1).

7865944803601 is an equidigital number, since it uses as much as digits as its factorization.

7865944803601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34836480, while the sum is 61.

The spelling of 7865944803601 in words is "seven trillion, eight hundred sixty-five billion, nine hundred forty-four million, eight hundred three thousand, six hundred one".