7218887283689 has 2 divisors, whose sum is σ = 7218887283690. Its totient is φ = 7218887283688.

The previous prime is 7218887283679. The next prime is 7218887283763. The reversal of 7218887283689 is 9863827888127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6633241458064 + 585645825625 = 2575508^2 + 765275^2 .

It is an emirp because it is prime and its reverse (9863827888127) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7218887283689 is a prime.

It is a super-2 number, since 2×7218887283689² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7218887283659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3609443641844 + 3609443641845.

It is an arithmetic number, because the mean of its divisors is an integer number (3609443641845).

Almost surely, 2^{7218887283689} is an apocalyptic number.

It is an amenable number.

7218887283689 is a deficient number, since it is larger than the sum of its proper divisors (1).

7218887283689 is an equidigital number, since it uses as much as digits as its factorization.

7218887283689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1040449536, while the sum is 77.

The spelling of 7218887283689 in words is "seven trillion, two hundred eighteen billion, eight hundred eighty-seven million, two hundred eighty-three thousand, six hundred eighty-nine".