128494686739 has 2 divisors, whose sum is σ = 128494686740. Its totient is φ = 128494686738.

The previous prime is 128494686637. The next prime is 128494686757. The reversal of 128494686739 is 937686494821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128494686739 - 2¹⁷ = 128494555667 is a prime.

It is not a weakly prime, because it can be changed into another prime (128494683739) 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, 64247343369 + 64247343370.

It is an arithmetic number, because the mean of its divisors is an integer number (64247343370).

Almost surely, 2^128494686739 is an apocalyptic number.

128494686739 is a deficient number, since it is larger than the sum of its proper divisors (1).

128494686739 is an equidigital number, since it uses as much as digits as its factorization.

128494686739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 125411328, while the sum is 67.

The spelling of 128494686739 in words is "one hundred twenty-eight billion, four hundred ninety-four million, six hundred eighty-six thousand, seven hundred thirty-nine".