27658248649 has 2 divisors, whose sum is σ = 27658248650. Its totient is φ = 27658248648.

The previous prime is 27658248623. The next prime is 27658248659. The reversal of 27658248649 is 94684285672.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27658018249 + 230400 = 166307^2 + 480^2 .

It is a cyclic number.

It is not a de Polignac number, because 27658248649 - 2¹⁵ = 27658215881 is a prime.

It is not a weakly prime, because it can be changed into another prime (27658248659) 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, 13829124324 + 13829124325.

It is an arithmetic number, because the mean of its divisors is an integer number (13829124325).

Almost surely, 2^27658248649 is an apocalyptic number.

It is an amenable number.

27658248649 is a deficient number, since it is larger than the sum of its proper divisors (1).

27658248649 is an equidigital number, since it uses as much as digits as its factorization.

27658248649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46448640, while the sum is 61.

The spelling of 27658248649 in words is "twenty-seven billion, six hundred fifty-eight million, two hundred forty-eight thousand, six hundred forty-nine".