27958869509 has 2 divisors, whose sum is σ = 27958869510. Its totient is φ = 27958869508.

The previous prime is 27958869469. The next prime is 27958869553. The reversal of 27958869509 is 90596885972.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23678438884 + 4280430625 = 153878^2 + 65425^2 .

It is a cyclic number.

It is not a de Polignac number, because 27958869509 - 2¹² = 27958865413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27958869709) 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, 13979434754 + 13979434755.

It is an arithmetic number, because the mean of its divisors is an integer number (13979434755).

Almost surely, 2^27958869509 is an apocalyptic number.

It is an amenable number.

27958869509 is a deficient number, since it is larger than the sum of its proper divisors (1).

27958869509 is an equidigital number, since it uses as much as digits as its factorization.

27958869509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 97977600, while the sum is 68.

The spelling of 27958869509 in words is "twenty-seven billion, nine hundred fifty-eight million, eight hundred sixty-nine thousand, five hundred nine".