27129826186549 has 2 divisors, whose sum is σ = 27129826186550. Its totient is φ = 27129826186548.

The previous prime is 27129826186487. The next prime is 27129826186633. The reversal of 27129826186549 is 94568162892172.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21197644728100 + 5932181458449 = 4604090^2 + 2435607^2 .

It is a cyclic number.

It is not a de Polignac number, because 27129826186549 - 2⁹ = 27129826186037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27129826106549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13564913093274 + 13564913093275.

It is an arithmetic number, because the mean of its divisors is an integer number (13564913093275).

Almost surely, 2^{27129826186549} is an apocalyptic number.

It is an amenable number.

27129826186549 is a deficient number, since it is larger than the sum of its proper divisors (1).

27129826186549 is an equidigital number, since it uses as much as digits as its factorization.

27129826186549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 209018880, while the sum is 70.

The spelling of 27129826186549 in words is "twenty-seven trillion, one hundred twenty-nine billion, eight hundred twenty-six million, one hundred eighty-six thousand, five hundred forty-nine".