128494686637 has 2 divisors, whose sum is σ = 128494686638. Its totient is φ = 128494686636.

The previous prime is 128494686631. The next prime is 128494686739. The reversal of 128494686637 is 736686494821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125182223721 + 3312462916 = 353811^2 + 57554^2 .

It is a cyclic number.

It is not a de Polignac number, because 128494686637 - 2¹⁵ = 128494653869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128494686631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64247343318 + 64247343319.

It is an arithmetic number, because the mean of its divisors is an integer number (64247343319).

Almost surely, 2^128494686637 is an apocalyptic number.

It is an amenable number.

128494686637 is a deficient number, since it is larger than the sum of its proper divisors (1).

128494686637 is an equidigital number, since it uses as much as digits as its factorization.

128494686637 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 83607552, while the sum is 64.

The spelling of 128494686637 in words is "one hundred twenty-eight billion, four hundred ninety-four million, six hundred eighty-six thousand, six hundred thirty-seven".