19664221259 has 2 divisors, whose sum is σ = 19664221260. Its totient is φ = 19664221258.

The previous prime is 19664221237. The next prime is 19664221327. The reversal of 19664221259 is 95212246691.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19664221259 - 2¹² = 19664217163 is a prime.

It is not a weakly prime, because it can be changed into another prime (19664221859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9832110629 + 9832110630.

It is an arithmetic number, because the mean of its divisors is an integer number (9832110630).

Almost surely, 2^19664221259 is an apocalyptic number.

19664221259 is a deficient number, since it is larger than the sum of its proper divisors (1).

19664221259 is an equidigital number, since it uses as much as digits as its factorization.

19664221259 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 466560, while the sum is 47.

The spelling of 19664221259 in words is "nineteen billion, six hundred sixty-four million, two hundred twenty-one thousand, two hundred fifty-nine".