27697776809 has 2 divisors, whose sum is σ = 27697776810. Its totient is φ = 27697776808.

The previous prime is 27697776803. The next prime is 27697776829. The reversal of 27697776809 is 90867779672.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27144210025 + 553566784 = 164755^2 + 23528^2 .

It is a cyclic number.

It is not a de Polignac number, because 27697776809 - 2¹⁶ = 27697711273 is a prime.

It is a super-2 number, since 2×27697776809² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (27697776803) 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, 13848888404 + 13848888405.

It is an arithmetic number, because the mean of its divisors is an integer number (13848888405).

Almost surely, 2^27697776809 is an apocalyptic number.

It is an amenable number.

27697776809 is a deficient number, since it is larger than the sum of its proper divisors (1).

27697776809 is an equidigital number, since it uses as much as digits as its factorization.

27697776809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112021056, while the sum is 68.

The spelling of 27697776809 in words is "twenty-seven billion, six hundred ninety-seven million, seven hundred seventy-six thousand, eight hundred nine".