20196619849451 has 2 divisors, whose sum is σ = 20196619849452. Its totient is φ = 20196619849450.

The previous prime is 20196619849447. The next prime is 20196619849457. The reversal of 20196619849451 is 15494891669102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20196619849451 - 2² = 20196619849447 is a prime.

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, 10098309924725 + 10098309924726.

It is an arithmetic number, because the mean of its divisors is an integer number (10098309924726).

Almost surely, 2^{20196619849451} is an apocalyptic number.

20196619849451 is a deficient number, since it is larger than the sum of its proper divisors (1).

20196619849451 is an equidigital number, since it uses as much as digits as its factorization.

20196619849451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 33592320, while the sum is 65.

The spelling of 20196619849451 in words is "twenty trillion, one hundred ninety-six billion, six hundred nineteen million, eight hundred forty-nine thousand, four hundred fifty-one".