27690208673 has 2 divisors, whose sum is σ = 27690208674. Its totient is φ = 27690208672.

The previous prime is 27690208661. The next prime is 27690208681. The reversal of 27690208673 is 37680209672.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14201012224 + 13489196449 = 119168^2 + 116143^2 .

It is a cyclic number.

It is not a de Polignac number, because 27690208673 - 2¹⁴ = 27690192289 is a prime.

It is not a weakly prime, because it can be changed into another prime (27690208603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13845104336 + 13845104337.

It is an arithmetic number, because the mean of its divisors is an integer number (13845104337).

Almost surely, 2^27690208673 is an apocalyptic number.

It is an amenable number.

27690208673 is a deficient number, since it is larger than the sum of its proper divisors (1).

27690208673 is an equidigital number, since it uses as much as digits as its factorization.

27690208673 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1524096, while the sum is 50.

Subtracting 27690208673 from its reverse (37680209672), we obtain a palindrome (9990000999).

The spelling of 27690208673 in words is "twenty-seven billion, six hundred ninety million, two hundred eight thousand, six hundred seventy-three".