128531686433 has 2 divisors, whose sum is σ = 128531686434. Its totient is φ = 128531686432.

The previous prime is 128531686411. The next prime is 128531686483. The reversal of 128531686433 is 334686135821.

It is an a-pointer prime, because the next prime (128531686483) can be obtained adding 128531686433 to its sum of digits (50).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127368330769 + 1163355664 = 356887^2 + 34108^2 .

It is an emirp because it is prime and its reverse (334686135821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128531686433 - 2⁸ = 128531686177 is a prime.

It is a super-2 number, since 2×128531686433² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (128531686483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64265843216 + 64265843217.

It is an arithmetic number, because the mean of its divisors is an integer number (64265843217).

Almost surely, 2^128531686433 is an apocalyptic number.

It is an amenable number.

128531686433 is a deficient number, since it is larger than the sum of its proper divisors (1).

128531686433 is an equidigital number, since it uses as much as digits as its factorization.

128531686433 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2488320, while the sum is 50.

The spelling of 128531686433 in words is "one hundred twenty-eight billion, five hundred thirty-one million, six hundred eighty-six thousand, four hundred thirty-three".