27659289649 has 2 divisors, whose sum is σ = 27659289650. Its totient is φ = 27659289648.

The previous prime is 27659289643. The next prime is 27659289683. The reversal of 27659289649 is 94698295672.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18223110049 + 9436179600 = 134993^2 + 97140^2 .

It is a cyclic number.

It is not a de Polignac number, because 27659289649 - 2¹³ = 27659281457 is a prime.

It is not a weakly prime, because it can be changed into another prime (27659289643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13829644824 + 13829644825.

It is an arithmetic number, because the mean of its divisors is an integer number (13829644825).

Almost surely, 2^27659289649 is an apocalyptic number.

It is an amenable number.

27659289649 is a deficient number, since it is larger than the sum of its proper divisors (1).

27659289649 is an equidigital number, since it uses as much as digits as its factorization.

27659289649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 117573120, while the sum is 67.

The spelling of 27659289649 in words is "twenty-seven billion, six hundred fifty-nine million, two hundred eighty-nine thousand, six hundred forty-nine".