28518663193 has 2 divisors, whose sum is σ = 28518663194. Its totient is φ = 28518663192.

The previous prime is 28518663139. The next prime is 28518663253. The reversal of 28518663193 is 39136681582.

Together with previous prime (28518663139) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28505932569 + 12730624 = 168837^2 + 3568^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28518663193 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28518663193.

It is not a weakly prime, because it can be changed into another prime (28518660193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14259331596 + 14259331597.

It is an arithmetic number, because the mean of its divisors is an integer number (14259331597).

Almost surely, 2^28518663193 is an apocalyptic number.

It is an amenable number.

28518663193 is a deficient number, since it is larger than the sum of its proper divisors (1).

28518663193 is an equidigital number, since it uses as much as digits as its factorization.

28518663193 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1866240, while the sum is 52.

The spelling of 28518663193 in words is "twenty-eight billion, five hundred eighteen million, six hundred sixty-three thousand, one hundred ninety-three".