20196619849447 has 2 divisors, whose sum is σ = 20196619849448. Its totient is φ = 20196619849446.

The previous prime is 20196619849381. The next prime is 20196619849451. The reversal of 20196619849447 is 74494891669102.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20196619849447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20196619849457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10098309924723 + 10098309924724.

It is an arithmetic number, because the mean of its divisors is an integer number (10098309924724).

Almost surely, 2^{20196619849447} is an apocalyptic number.

20196619849447 is a deficient number, since it is larger than the sum of its proper divisors (1).

20196619849447 is an equidigital number, since it uses as much as digits as its factorization.

20196619849447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 188116992, while the sum is 70.

The spelling of 20196619849447 in words is "twenty trillion, one hundred ninety-six billion, six hundred nineteen million, eight hundred forty-nine thousand, four hundred forty-seven".