19118392583681 has 2 divisors, whose sum is σ = 19118392583682. Its totient is φ = 19118392583680.

The previous prime is 19118392583671. The next prime is 19118392583707. The reversal of 19118392583681 is 18638529381191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17685523733056 + 1432868850625 = 4205416^2 + 1197025^2 .

It is a cyclic number.

It is not a de Polignac number, because 19118392583681 - 2¹⁴ = 19118392567297 is a prime.

It is a super-2 number, since 2×19118392583681² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19118392583671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9559196291840 + 9559196291841.

It is an arithmetic number, because the mean of its divisors is an integer number (9559196291841).

Almost surely, 2^{19118392583681} is an apocalyptic number.

It is an amenable number.

19118392583681 is a deficient number, since it is larger than the sum of its proper divisors (1).

19118392583681 is an equidigital number, since it uses as much as digits as its factorization.

19118392583681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22394880, while the sum is 65.

The spelling of 19118392583681 in words is "nineteen trillion, one hundred eighteen billion, three hundred ninety-two million, five hundred eighty-three thousand, six hundred eighty-one".