128686301021869 has 2 divisors, whose sum is σ = 128686301021870. Its totient is φ = 128686301021868.

The previous prime is 128686301021813. The next prime is 128686301021903. The reversal of 128686301021869 is 968120103686821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 126951192976644 + 1735108045225 = 11267262^2 + 1317235^2 .

It is a cyclic number.

It is not a de Polignac number, because 128686301021869 - 2²¹ = 128686298924717 is a prime.

It is a super-2 number, since 2×128686301021869² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128686301025869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64343150510934 + 64343150510935.

It is an arithmetic number, because the mean of its divisors is an integer number (64343150510935).

Almost surely, 2^{128686301021869} is an apocalyptic number.

It is an amenable number.

128686301021869 is a deficient number, since it is larger than the sum of its proper divisors (1).

128686301021869 is an equidigital number, since it uses as much as digits as its factorization.

128686301021869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11943936, while the sum is 61.

The spelling of 128686301021869 in words is "one hundred twenty-eight trillion, six hundred eighty-six billion, three hundred one million, twenty-one thousand, eight hundred sixty-nine".