27727157309 has 2 divisors, whose sum is σ = 27727157310. Its totient is φ = 27727157308.

The previous prime is 27727157291. The next prime is 27727157377. The reversal of 27727157309 is 90375172772.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26611396900 + 1115760409 = 163130^2 + 33403^2 .

It is a cyclic number.

It is not a de Polignac number, because 27727157309 - 2¹² = 27727153213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27727159309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13863578654 + 13863578655.

It is an arithmetic number, because the mean of its divisors is an integer number (13863578655).

Almost surely, 2^27727157309 is an apocalyptic number.

It is an amenable number.

27727157309 is a deficient number, since it is larger than the sum of its proper divisors (1).

27727157309 is an equidigital number, since it uses as much as digits as its factorization.

27727157309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296540, while the sum is 50.

The spelling of 27727157309 in words is "twenty-seven billion, seven hundred twenty-seven million, one hundred fifty-seven thousand, three hundred nine".