19533872881 has 2 divisors, whose sum is σ = 19533872882. Its totient is φ = 19533872880.

The previous prime is 19533872879. The next prime is 19533872909. The reversal of 19533872881 is 18827833591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17902440000 + 1631432881 = 133800^2 + 40391^2 .

It is a cyclic number.

It is not a de Polignac number, because 19533872881 - 2¹ = 19533872879 is a prime.

It is a super-2 number, since 2×19533872881² (a number of 21 digits) contains 22 as substring.

Together with 19533872879, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (19533872851) 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, 9766936440 + 9766936441.

It is an arithmetic number, because the mean of its divisors is an integer number (9766936441).

Almost surely, 2^19533872881 is an apocalyptic number.

It is an amenable number.

19533872881 is a deficient number, since it is larger than the sum of its proper divisors (1).

19533872881 is an equidigital number, since it uses as much as digits as its factorization.

19533872881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2903040, while the sum is 55.

The spelling of 19533872881 in words is "nineteen billion, five hundred thirty-three million, eight hundred seventy-two thousand, eight hundred eighty-one".