28255992863617 has 2 divisors, whose sum is σ = 28255992863618. Its totient is φ = 28255992863616.

The previous prime is 28255992863611. The next prime is 28255992863627. The reversal of 28255992863617 is 71636829955282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18197808960321 + 10058183903296 = 4265889^2 + 3171464^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28255992863617 is a prime.

It is a super-2 number, since 2×28255992863617² (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 28255992863617.

It is not a weakly prime, because it can be changed into another prime (28255992863611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14127996431808 + 14127996431809.

It is an arithmetic number, because the mean of its divisors is an integer number (14127996431809).

Almost surely, 2^{28255992863617} is an apocalyptic number.

It is an amenable number.

28255992863617 is a deficient number, since it is larger than the sum of its proper divisors (1).

28255992863617 is an equidigital number, since it uses as much as digits as its factorization.

28255992863617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 783820800, while the sum is 73.

The spelling of 28255992863617 in words is "twenty-eight trillion, two hundred fifty-five billion, nine hundred ninety-two million, eight hundred sixty-three thousand, six hundred seventeen".