19812453847 has 2 divisors, whose sum is σ = 19812453848. Its totient is φ = 19812453846.

The previous prime is 19812453841. The next prime is 19812453901. The reversal of 19812453847 is 74835421891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19812453847 - 2³ = 19812453839 is a prime.

It is a super-3 number, since 3×19812453847³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19812453794 and 19812453803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19812453841) 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, 9906226923 + 9906226924.

It is an arithmetic number, because the mean of its divisors is an integer number (9906226924).

Almost surely, 2^19812453847 is an apocalyptic number.

19812453847 is a deficient number, since it is larger than the sum of its proper divisors (1).

19812453847 is an equidigital number, since it uses as much as digits as its factorization.

19812453847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1935360, while the sum is 52.

The spelling of 19812453847 in words is "nineteen billion, eight hundred twelve million, four hundred fifty-three thousand, eight hundred forty-seven".