28518173998081 has 2 divisors, whose sum is σ = 28518173998082. Its totient is φ = 28518173998080.

The previous prime is 28518173998043. The next prime is 28518173998117. The reversal of 28518173998081 is 18089937181582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25475186817025 + 3042987181056 = 5047295^2 + 1744416^2 .

It is a cyclic number.

It is not a de Polignac number, because 28518173998081 - 2²¹ = 28518171900929 is a prime.

It is a super-2 number, since 2×28518173998081² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28518173998081.

It is not a weakly prime, because it can be changed into another prime (28518173998001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14259086999040 + 14259086999041.

It is an arithmetic number, because the mean of its divisors is an integer number (14259086999041).

Almost surely, 2^{28518173998081} is an apocalyptic number.

It is an amenable number.

28518173998081 is a deficient number, since it is larger than the sum of its proper divisors (1).

28518173998081 is an equidigital number, since it uses as much as digits as its factorization.

28518173998081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69672960, while the sum is 70.

The spelling of 28518173998081 in words is "twenty-eight trillion, five hundred eighteen billion, one hundred seventy-three million, nine hundred ninety-eight thousand, eighty-one".