8128855344949 has 2 divisors, whose sum is σ = 8128855344950. Its totient is φ = 8128855344948.

The previous prime is 8128855344889. The next prime is 8128855344971. The reversal of 8128855344949 is 9494435588218.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8128828232100 + 27112849 = 2851110^2 + 5207^2 .

It is a cyclic number.

It is not a de Polignac number, because 8128855344949 - 2⁹ = 8128855344437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8128855344989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4064427672474 + 4064427672475.

It is an arithmetic number, because the mean of its divisors is an integer number (4064427672475).

Almost surely, 2^{8128855344949} is an apocalyptic number.

It is an amenable number.

8128855344949 is a deficient number, since it is larger than the sum of its proper divisors (1).

8128855344949 is an equidigital number, since it uses as much as digits as its factorization.

8128855344949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 398131200, while the sum is 70.

The spelling of 8128855344949 in words is "eight trillion, one hundred twenty-eight billion, eight hundred fifty-five million, three hundred forty-four thousand, nine hundred forty-nine".