19809182635423 has 2 divisors, whose sum is σ = 19809182635424. Its totient is φ = 19809182635422.

The previous prime is 19809182635387. The next prime is 19809182635471. The reversal of 19809182635423 is 32453628190891.

It is a weak prime.

It is an emirp because it is prime and its reverse (32453628190891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19809182635423 - 2⁹ = 19809182634911 is a prime.

It is a super-2 number, since 2×19809182635423² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19809182635483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9904591317711 + 9904591317712.

It is an arithmetic number, because the mean of its divisors is an integer number (9904591317712).

Almost surely, 2^{19809182635423} is an apocalyptic number.

19809182635423 is a deficient number, since it is larger than the sum of its proper divisors (1).

19809182635423 is an equidigital number, since it uses as much as digits as its factorization.

19809182635423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22394880, while the sum is 61.

The spelling of 19809182635423 in words is "nineteen trillion, eight hundred nine billion, one hundred eighty-two million, six hundred thirty-five thousand, four hundred twenty-three".