27787540393 has 2 divisors, whose sum is σ = 27787540394. Its totient is φ = 27787540392.

The previous prime is 27787540387. The next prime is 27787540441. The reversal of 27787540393 is 39304578772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24708067344 + 3079473049 = 157188^2 + 55493^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27787540393 is a prime.

It is not a weakly prime, because it can be changed into another prime (27787540303) 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, 13893770196 + 13893770197.

It is an arithmetic number, because the mean of its divisors is an integer number (13893770197).

Almost surely, 2^27787540393 is an apocalyptic number.

It is an amenable number.

27787540393 is a deficient number, since it is larger than the sum of its proper divisors (1).

27787540393 is an equidigital number, since it uses as much as digits as its factorization.

27787540393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8890560, while the sum is 55.

The spelling of 27787540393 in words is "twenty-seven billion, seven hundred eighty-seven million, five hundred forty thousand, three hundred ninety-three".