27805808851 has 2 divisors, whose sum is σ = 27805808852. Its totient is φ = 27805808850.

The previous prime is 27805808813. The next prime is 27805808861. The reversal of 27805808851 is 15880850872.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27805808851 - 2⁹ = 27805808339 is a prime.

It is not a weakly prime, because it can be changed into another prime (27805808801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13902904425 + 13902904426.

It is an arithmetic number, because the mean of its divisors is an integer number (13902904426).

Almost surely, 2^27805808851 is an apocalyptic number.

27805808851 is a deficient number, since it is larger than the sum of its proper divisors (1).

27805808851 is an equidigital number, since it uses as much as digits as its factorization.

27805808851 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1433600, while the sum is 52.

The spelling of 27805808851 in words is "twenty-seven billion, eight hundred five million, eight hundred eight thousand, eight hundred fifty-one".