19884134993 has 2 divisors, whose sum is σ = 19884134994. Its totient is φ = 19884134992.

The previous prime is 19884134971. The next prime is 19884135083. The reversal of 19884134993 is 39943148891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19474760704 + 409374289 = 139552^2 + 20233^2 .

It is an emirp because it is prime and its reverse (39943148891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19884134993 - 2¹⁸ = 19883872849 is a prime.

It is a super-2 number, since 2×19884134993² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (19884434993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9942067496 + 9942067497.

It is an arithmetic number, because the mean of its divisors is an integer number (9942067497).

Almost surely, 2^19884134993 is an apocalyptic number.

It is an amenable number.

19884134993 is a deficient number, since it is larger than the sum of its proper divisors (1).

19884134993 is an equidigital number, since it uses as much as digits as its factorization.

19884134993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6718464, while the sum is 59.

The spelling of 19884134993 in words is "nineteen billion, eight hundred eighty-four million, one hundred thirty-four thousand, nine hundred ninety-three".