28512790669117 has 2 divisors, whose sum is σ = 28512790669118. Its totient is φ = 28512790669116.

The previous prime is 28512790669063. The next prime is 28512790669169. The reversal of 28512790669117 is 71196609721582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23405140948996 + 5107649720121 = 4837886^2 + 2260011^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28512790669117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28512790669217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14256395334558 + 14256395334559.

It is an arithmetic number, because the mean of its divisors is an integer number (14256395334559).

Almost surely, 2^{28512790669117} is an apocalyptic number.

It is an amenable number.

28512790669117 is a deficient number, since it is larger than the sum of its proper divisors (1).

28512790669117 is an equidigital number, since it uses as much as digits as its factorization.

28512790669117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22861440, while the sum is 64.

The spelling of 28512790669117 in words is "twenty-eight trillion, five hundred twelve billion, seven hundred ninety million, six hundred sixty-nine thousand, one hundred seventeen".