19664823047 has 2 divisors, whose sum is σ = 19664823048. Its totient is φ = 19664823046.

The previous prime is 19664823029. The next prime is 19664823161. The reversal of 19664823047 is 74032846691.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19664823047 - 2⁸ = 19664822791 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19664822986 and 19664823004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19664823947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9832411523 + 9832411524.

It is an arithmetic number, because the mean of its divisors is an integer number (9832411524).

Almost surely, 2^19664823047 is an apocalyptic number.

19664823047 is a deficient number, since it is larger than the sum of its proper divisors (1).

19664823047 is an equidigital number, since it uses as much as digits as its factorization.

19664823047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1741824, while the sum is 50.

The spelling of 19664823047 in words is "nineteen billion, six hundred sixty-four million, eight hundred twenty-three thousand, forty-seven".