28404500566181 has 2 divisors, whose sum is σ = 28404500566182. Its totient is φ = 28404500566180.

The previous prime is 28404500566163. The next prime is 28404500566213. The reversal of 28404500566181 is 18166500540482.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18161524349956 + 10242976216225 = 4261634^2 + 3200465^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28404500566181 is a prime.

It is a super-2 number, since 2×28404500566181² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28404500566681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14202250283090 + 14202250283091.

It is an arithmetic number, because the mean of its divisors is an integer number (14202250283091).

Almost surely, 2^{28404500566181} is an apocalyptic number.

It is an amenable number.

28404500566181 is a deficient number, since it is larger than the sum of its proper divisors (1).

28404500566181 is an equidigital number, since it uses as much as digits as its factorization.

28404500566181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1843200, while the sum is 50.

The spelling of 28404500566181 in words is "twenty-eight trillion, four hundred four billion, five hundred million, five hundred sixty-six thousand, one hundred eighty-one".