27891464833 has 2 divisors, whose sum is σ = 27891464834. Its totient is φ = 27891464832.

The previous prime is 27891464813. The next prime is 27891464837. The reversal of 27891464833 is 33846419872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27298639729 + 592825104 = 165223^2 + 24348^2 .

It is a cyclic number.

It is not a de Polignac number, because 27891464833 - 2¹⁷ = 27891333761 is a prime.

It is not a weakly prime, because it can be changed into another prime (27891464837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13945732416 + 13945732417.

It is an arithmetic number, because the mean of its divisors is an integer number (13945732417).

Almost surely, 2^27891464833 is an apocalyptic number.

It is an amenable number.

27891464833 is a deficient number, since it is larger than the sum of its proper divisors (1).

27891464833 is an equidigital number, since it uses as much as digits as its factorization.

27891464833 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6967296, while the sum is 55.

The spelling of 27891464833 in words is "twenty-seven billion, eight hundred ninety-one million, four hundred sixty-four thousand, eight hundred thirty-three".