19581386107396 has 27 divisors (see below), whose sum is σ = 34604960131413. Its totient is φ = 9695186422560.

The previous prime is 19581386107379. The next prime is 19581386107397. The reversal of 19581386107396 is 69370168318591.

The square root of 19581386107396 is 4425086.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 14181897364996 + 5399488742400 = 3765886^2 + 2323680^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19581386107397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 911556976 + ... + 911578456.

Almost surely, 2^{19581386107396} is an apocalyptic number.

19581386107396 is the 4425086-th square number.

It is an amenable number.

19581386107396 is a deficient number, since it is larger than the sum of its proper divisors (15023574024017).

19581386107396 is an frugal number, since it uses more digits than its factorization.

19581386107396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43172 (or 21586 counting only the distinct ones).

The product of its (nonzero) digits is 58786560, while the sum is 67.

The spelling of 19581386107396 in words is "nineteen trillion, five hundred eighty-one billion, three hundred eighty-six million, one hundred seven thousand, three hundred ninety-six".