19337686661 has 2 divisors, whose sum is σ = 19337686662. Its totient is φ = 19337686660.

The previous prime is 19337686637. The next prime is 19337686673. The reversal of 19337686661 is 16668673391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13387878436 + 5949808225 = 115706^2 + 77135^2 .

It is an emirp because it is prime and its reverse (16668673391) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19337686661 - 2¹⁰ = 19337685637 is a prime.

It is a super-2 number, since 2×19337686661² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19337686597 and 19337686606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19337686631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9668843330 + 9668843331.

It is an arithmetic number, because the mean of its divisors is an integer number (9668843331).

Almost surely, 2^19337686661 is an apocalyptic number.

It is an amenable number.

19337686661 is a deficient number, since it is larger than the sum of its proper divisors (1).

19337686661 is an equidigital number, since it uses as much as digits as its factorization.

19337686661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5878656, while the sum is 56.

The spelling of 19337686661 in words is "nineteen billion, three hundred thirty-seven million, six hundred eighty-six thousand, six hundred sixty-one".