27427077945409 has 2 divisors, whose sum is σ = 27427077945410. Its totient is φ = 27427077945408.

The previous prime is 27427077945359. The next prime is 27427077945479. The reversal of 27427077945409 is 90454977072472.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27230101753009 + 196976192400 = 5218247^2 + 443820^2 .

It is a cyclic number.

It is not a de Polignac number, because 27427077945409 - 2²⁹ = 27426541074497 is a prime.

It is not a weakly prime, because it can be changed into another prime (27427077945479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13713538972704 + 13713538972705.

It is an arithmetic number, because the mean of its divisors is an integer number (13713538972705).

Almost surely, 2^{27427077945409} is an apocalyptic number.

It is an amenable number.

27427077945409 is a deficient number, since it is larger than the sum of its proper divisors (1).

27427077945409 is an equidigital number, since it uses as much as digits as its factorization.

27427077945409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 248935680, while the sum is 67.

The spelling of 27427077945409 in words is "twenty-seven trillion, four hundred twenty-seven billion, seventy-seven million, nine hundred forty-five thousand, four hundred nine".