7287168913909 has 2 divisors, whose sum is σ = 7287168913910. Its totient is φ = 7287168913908.

The previous prime is 7287168913907. The next prime is 7287168913939. The reversal of 7287168913909 is 9093198617827.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7147575515025 + 139593398884 = 2673495^2 + 373622^2 .

It is a cyclic number.

It is not a de Polignac number, because 7287168913909 - 2¹ = 7287168913907 is a prime.

Together with 7287168913907, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7287168913907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3643584456954 + 3643584456955.

It is an arithmetic number, because the mean of its divisors is an integer number (3643584456955).

Almost surely, 2^{7287168913909} is an apocalyptic number.

It is an amenable number.

7287168913909 is a deficient number, since it is larger than the sum of its proper divisors (1).

7287168913909 is an equidigital number, since it uses as much as digits as its factorization.

7287168913909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82301184, while the sum is 70.

The spelling of 7287168913909 in words is "seven trillion, two hundred eighty-seven billion, one hundred sixty-eight million, nine hundred thirteen thousand, nine hundred nine".