128984602786549 has 2 divisors, whose sum is σ = 128984602786550. Its totient is φ = 128984602786548.

The previous prime is 128984602786513. The next prime is 128984602786603. The reversal of 128984602786549 is 945687206489821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83941914168324 + 45042688618225 = 9161982^2 + 6711385^2 .

It is a cyclic number.

It is not a de Polignac number, because 128984602786549 - 2¹⁵ = 128984602753781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128984602766549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64492301393274 + 64492301393275.

It is an arithmetic number, because the mean of its divisors is an integer number (64492301393275).

Almost surely, 2^{128984602786549} is an apocalyptic number.

It is an amenable number.

128984602786549 is a deficient number, since it is larger than the sum of its proper divisors (1).

128984602786549 is an equidigital number, since it uses as much as digits as its factorization.

128984602786549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3344302080, while the sum is 79.

The spelling of 128984602786549 in words is "one hundred twenty-eight trillion, nine hundred eighty-four billion, six hundred two million, seven hundred eighty-six thousand, five hundred forty-nine".