78280255489 has 2 divisors, whose sum is σ = 78280255490. Its totient is φ = 78280255488.

The previous prime is 78280255481. The next prime is 78280255549. The reversal of 78280255489 is 98455208287.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69850261264 + 8429994225 = 264292^2 + 91815^2 .

It is a cyclic number.

It is not a de Polignac number, because 78280255489 - 2³ = 78280255481 is a prime.

It is a super-2 number, since 2×78280255489² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78280255481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39140127744 + 39140127745.

It is an arithmetic number, because the mean of its divisors is an integer number (39140127745).

Almost surely, 2^78280255489 is an apocalyptic number.

It is an amenable number.

78280255489 is a deficient number, since it is larger than the sum of its proper divisors (1).

78280255489 is an equidigital number, since it uses as much as digits as its factorization.

78280255489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12902400, while the sum is 58.

The spelling of 78280255489 in words is "seventy-eight billion, two hundred eighty million, two hundred fifty-five thousand, four hundred eighty-nine".