27942789851 has 2 divisors, whose sum is σ = 27942789852. Its totient is φ = 27942789850.

The previous prime is 27942789841. The next prime is 27942789887. The reversal of 27942789851 is 15898724972.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27942789851 - 2³⁰ = 26869048027 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (27942789841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13971394925 + 13971394926.

It is an arithmetic number, because the mean of its divisors is an integer number (13971394926).

Almost surely, 2^27942789851 is an apocalyptic number.

27942789851 is a deficient number, since it is larger than the sum of its proper divisors (1).

27942789851 is an equidigital number, since it uses as much as digits as its factorization.

27942789851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20321280, while the sum is 62.

The spelling of 27942789851 in words is "twenty-seven billion, nine hundred forty-two million, seven hundred eighty-nine thousand, eight hundred fifty-one".