19636968677 has 2 divisors, whose sum is σ = 19636968678. Its totient is φ = 19636968676.

The previous prime is 19636968629. The next prime is 19636968707. The reversal of 19636968677 is 77686963691.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10452813121 + 9184155556 = 102239^2 + 95834^2 .

It is a cyclic number.

It is not a de Polignac number, because 19636968677 - 2¹⁰ = 19636967653 is a prime.

It is a super-2 number, since 2×19636968677² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19636968607) 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, 9818484338 + 9818484339.

It is an arithmetic number, because the mean of its divisors is an integer number (9818484339).

Almost surely, 2^19636968677 is an apocalyptic number.

It is an amenable number.

19636968677 is a deficient number, since it is larger than the sum of its proper divisors (1).

19636968677 is an equidigital number, since it uses as much as digits as its factorization.

19636968677 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 123451776, while the sum is 68.

The spelling of 19636968677 in words is "nineteen billion, six hundred thirty-six million, nine hundred sixty-eight thousand, six hundred seventy-seven".