28255507805491 has 2 divisors, whose sum is σ = 28255507805492. Its totient is φ = 28255507805490.

The previous prime is 28255507805489. The next prime is 28255507805521. The reversal of 28255507805491 is 19450870555282.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28255507805491 - 2¹ = 28255507805489 is a prime.

Together with 28255507805489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28255507802491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14127753902745 + 14127753902746.

It is an arithmetic number, because the mean of its divisors is an integer number (14127753902746).

Almost surely, 2^{28255507805491} is an apocalyptic number.

28255507805491 is a deficient number, since it is larger than the sum of its proper divisors (1).

28255507805491 is an equidigital number, since it uses as much as digits as its factorization.

28255507805491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320000, while the sum is 61.

The spelling of 28255507805491 in words is "twenty-eight trillion, two hundred fifty-five billion, five hundred seven million, eight hundred five thousand, four hundred ninety-one".