27791782729 has 2 divisors, whose sum is σ = 27791782730. Its totient is φ = 27791782728.

The previous prime is 27791782693. The next prime is 27791782757. The reversal of 27791782729 is 92728719772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26423152704 + 1368630025 = 162552^2 + 36995^2 .

It is a cyclic number.

It is not a de Polignac number, because 27791782729 - 2⁹ = 27791782217 is a prime.

It is not a weakly prime, because it can be changed into another prime (27791732729) 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, 13895891364 + 13895891365.

It is an arithmetic number, because the mean of its divisors is an integer number (13895891365).

Almost surely, 2^27791782729 is an apocalyptic number.

It is an amenable number.

27791782729 is a deficient number, since it is larger than the sum of its proper divisors (1).

27791782729 is an equidigital number, since it uses as much as digits as its factorization.

27791782729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12446784, while the sum is 61.

The spelling of 27791782729 in words is "twenty-seven billion, seven hundred ninety-one million, seven hundred eighty-two thousand, seven hundred twenty-nine".