7881755489 has 2 divisors, whose sum is σ = 7881755490. Its totient is φ = 7881755488.

The previous prime is 7881755473. The next prime is 7881755551. The reversal of 7881755489 is 9845571887.

It is an a-pointer prime, because the next prime (7881755551) can be obtained adding 7881755489 to its sum of digits (62).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7565520400 + 316235089 = 86980^2 + 17783^2 .

It is an emirp because it is prime and its reverse (9845571887) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7881755489 - 2⁴ = 7881755473 is a prime.

It is not a weakly prime, because it can be changed into another prime (7881755449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3940877744 + 3940877745.

It is an arithmetic number, because the mean of its divisors is an integer number (3940877745).

Almost surely, 2^7881755489 is an apocalyptic number.

It is an amenable number.

7881755489 is a deficient number, since it is larger than the sum of its proper divisors (1).

7881755489 is an equidigital number, since it uses as much as digits as its factorization.

7881755489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22579200, while the sum is 62.

The square root of 7881755489 is about 88779.2514555062. The cubic root of 7881755489 is about 1990.0973403393.

The spelling of 7881755489 in words is "seven billion, eight hundred eighty-one million, seven hundred fifty-five thousand, four hundred eighty-nine".