19382720881 has 2 divisors, whose sum is σ = 19382720882. Its totient is φ = 19382720880.

The previous prime is 19382720879. The next prime is 19382720921. The reversal of 19382720881 is 18802728391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17724928225 + 1657792656 = 133135^2 + 40716^2 .

It is a cyclic number.

It is not a de Polignac number, because 19382720881 - 2¹ = 19382720879 is a prime.

It is a super-2 number, since 2×19382720881² (a number of 21 digits) contains 22 as substring.

Together with 19382720879, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (19382720821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9691360440 + 9691360441.

It is an arithmetic number, because the mean of its divisors is an integer number (9691360441).

Almost surely, 2^19382720881 is an apocalyptic number.

It is an amenable number.

19382720881 is a deficient number, since it is larger than the sum of its proper divisors (1).

19382720881 is an equidigital number, since it uses as much as digits as its factorization.

19382720881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 387072, while the sum is 49.

The spelling of 19382720881 in words is "nineteen billion, three hundred eighty-two million, seven hundred twenty thousand, eight hundred eighty-one".