28559799181 has 2 divisors, whose sum is σ = 28559799182. Its totient is φ = 28559799180.

The previous prime is 28559799173. The next prime is 28559799197. The reversal of 28559799181 is 18199795582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28267696900 + 292102281 = 168130^2 + 17091^2 .

It is a cyclic number.

It is not a de Polignac number, because 28559799181 - 2³ = 28559799173 is a prime.

It is a super-2 number, since 2×28559799181² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28559739181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14279899590 + 14279899591.

It is an arithmetic number, because the mean of its divisors is an integer number (14279899591).

Almost surely, 2^28559799181 is an apocalyptic number.

It is an amenable number.

28559799181 is a deficient number, since it is larger than the sum of its proper divisors (1).

28559799181 is an equidigital number, since it uses as much as digits as its factorization.

28559799181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16329600, while the sum is 64.

The spelling of 28559799181 in words is "twenty-eight billion, five hundred fifty-nine million, seven hundred ninety-nine thousand, one hundred eighty-one".