28255805353161 has 27 divisors (see below), whose sum is σ = 40939285218741. Its totient is φ = 18779529102624.

The previous prime is 28255805353103. The next prime is 28255805353163. The reversal of 28255805353161 is 16135350855282.

The square root of 28255805353161 is 5315619.

It is a perfect power (a square), and thus also a powerful number.

28255805353161 is a `hidden beast` number, since 2 + 8 + 2 + 5 + 58 + 0 + 53 + 531 + 6 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 16236104654025 + 12019700699136 = 4029405^2 + 3466944^2 .

It is not a de Polignac number, because 28255805353161 - 2¹¹ = 28255805351113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28255805353098 and 28255805353107.

It is not an unprimeable number, because it can be changed into a prime (28255805353163) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 5565450555 + ... + 5565455631.

Almost surely, 2^{28255805353161} is an apocalyptic number.

28255805353161 is the 5315619-th square number.

28255805353161 is the 2657810-th centered octagonal number.

It is an amenable number.

28255805353161 is a deficient number, since it is larger than the sum of its proper divisors (12683479865580).

28255805353161 is an frugal number, since it uses more digits than its factorization.

28255805353161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10858 (or 5429 counting only the distinct ones).

The product of its (nonzero) digits is 8640000, while the sum is 54.

The spelling of 28255805353161 in words is "twenty-eight trillion, two hundred fifty-five billion, eight hundred five million, three hundred fifty-three thousand, one hundred sixty-one".