19713677771 has 2 divisors, whose sum is σ = 19713677772. Its totient is φ = 19713677770.

The previous prime is 19713677749. The next prime is 19713677777. The reversal of 19713677771 is 17777631791.

It is a strong prime.

It is an emirp because it is prime and its reverse (17777631791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19713677771 - 2¹⁰ = 19713676747 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (19713677777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9856838885 + 9856838886.

It is an arithmetic number, because the mean of its divisors is an integer number (9856838886).

Almost surely, 2^19713677771 is an apocalyptic number.

19713677771 is a deficient number, since it is larger than the sum of its proper divisors (1).

19713677771 is an equidigital number, since it uses as much as digits as its factorization.

19713677771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2722734, while the sum is 56.

The spelling of 19713677771 in words is "nineteen billion, seven hundred thirteen million, six hundred seventy-seven thousand, seven hundred seventy-one".