28210013668181 has 2 divisors, whose sum is σ = 28210013668182. Its totient is φ = 28210013668180.

The previous prime is 28210013668147. The next prime is 28210013668229. The reversal of 28210013668181 is 18186631001282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27948499049956 + 261514618225 = 5286634^2 + 511385^2 .

It is a cyclic number.

It is not a de Polignac number, because 28210013668181 - 2¹⁸ = 28210013406037 is a prime.

It is a super-2 number, since 2×28210013668181² (a number of 28 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28210013668381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14105006834090 + 14105006834091.

It is an arithmetic number, because the mean of its divisors is an integer number (14105006834091).

Almost surely, 2^{28210013668181} is an apocalyptic number.

It is an amenable number.

28210013668181 is a deficient number, since it is larger than the sum of its proper divisors (1).

28210013668181 is an equidigital number, since it uses as much as digits as its factorization.

28210013668181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 221184, while the sum is 47.

The spelling of 28210013668181 in words is "twenty-eight trillion, two hundred ten billion, thirteen million, six hundred sixty-eight thousand, one hundred eighty-one".