19645614479 has 2 divisors, whose sum is σ = 19645614480. Its totient is φ = 19645614478.

The previous prime is 19645614413. The next prime is 19645614481. The reversal of 19645614479 is 97441654691.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19645614479 is a prime.

Together with 19645614481, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19645614179) 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, 9822807239 + 9822807240.

It is an arithmetic number, because the mean of its divisors is an integer number (9822807240).

Almost surely, 2^19645614479 is an apocalyptic number.

19645614479 is a deficient number, since it is larger than the sum of its proper divisors (1).

19645614479 is an equidigital number, since it uses as much as digits as its factorization.

19645614479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6531840, while the sum is 56.

The spelling of 19645614479 in words is "nineteen billion, six hundred forty-five million, six hundred fourteen thousand, four hundred seventy-nine".