27956388851 has 2 divisors, whose sum is σ = 27956388852. Its totient is φ = 27956388850.

The previous prime is 27956388839. The next prime is 27956388869. The reversal of 27956388851 is 15888365972.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27956388851 - 2¹⁸ = 27956126707 is a prime.

It is not a weakly prime, because it can be changed into another prime (27956388451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13978194425 + 13978194426.

It is an arithmetic number, because the mean of its divisors is an integer number (13978194426).

Almost surely, 2^27956388851 is an apocalyptic number.

27956388851 is a deficient number, since it is larger than the sum of its proper divisors (1).

27956388851 is an equidigital number, since it uses as much as digits as its factorization.

27956388851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29030400, while the sum is 62.

The spelling of 27956388851 in words is "twenty-seven billion, nine hundred fifty-six million, three hundred eighty-eight thousand, eight hundred fifty-one".