19945677659 has 2 divisors, whose sum is σ = 19945677660. Its totient is φ = 19945677658.

The previous prime is 19945677649. The next prime is 19945677683. The reversal of 19945677659 is 95677654991.

It is a weak prime.

It is an emirp because it is prime and its reverse (95677654991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19945677659 - 2⁴ = 19945677643 is a prime.

It is not a weakly prime, because it can be changed into another prime (19945677649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9972838829 + 9972838830.

It is an arithmetic number, because the mean of its divisors is an integer number (9972838830).

Almost surely, 2^19945677659 is an apocalyptic number.

19945677659 is a deficient number, since it is larger than the sum of its proper divisors (1).

19945677659 is an equidigital number, since it uses as much as digits as its factorization.

19945677659 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 128595600, while the sum is 68.

The spelling of 19945677659 in words is "nineteen billion, nine hundred forty-five million, six hundred seventy-seven thousand, six hundred fifty-nine".