27771756797 has 2 divisors, whose sum is σ = 27771756798. Its totient is φ = 27771756796.

The previous prime is 27771756791. The next prime is 27771756827. The reversal of 27771756797 is 79765717772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26664930436 + 1106826361 = 163294^2 + 33269^2 .

It is a cyclic number.

It is not a de Polignac number, because 27771756797 - 2⁴ = 27771756781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27771756791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13885878398 + 13885878399.

It is an arithmetic number, because the mean of its divisors is an integer number (13885878399).

Almost surely, 2^27771756797 is an apocalyptic number.

It is an amenable number.

27771756797 is a deficient number, since it is larger than the sum of its proper divisors (1).

27771756797 is an equidigital number, since it uses as much as digits as its factorization.

27771756797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63530460, while the sum is 65.

The spelling of 27771756797 in words is "twenty-seven billion, seven hundred seventy-one million, seven hundred fifty-six thousand, seven hundred ninety-seven".