27717697771 has 2 divisors, whose sum is σ = 27717697772. Its totient is φ = 27717697770.

The previous prime is 27717697723. The next prime is 27717697837. The reversal of 27717697771 is 17779671772.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27717697771 - 2⁷ = 27717697643 is a prime.

It is not a weakly prime, because it can be changed into another prime (27717697571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13858848885 + 13858848886.

It is an arithmetic number, because the mean of its divisors is an integer number (13858848886).

Almost surely, 2^27717697771 is an apocalyptic number.

27717697771 is a deficient number, since it is larger than the sum of its proper divisors (1).

27717697771 is an equidigital number, since it uses as much as digits as its factorization.

27717697771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12706092, while the sum is 61.

The spelling of 27717697771 in words is "twenty-seven billion, seven hundred seventeen million, six hundred ninety-seven thousand, seven hundred seventy-one".