19447116243681 has 32 divisors (see below), whose sum is σ = 29696623345408. Its totient is φ = 11089064954880.

The previous prime is 19447116243673. The next prime is 19447116243689. The reversal of 19447116243681 is 18634261174491.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (19447116243673) and next prime (19447116243689).

It is not a de Polignac number, because 19447116243681 - 2³ = 19447116243673 is a prime.

It is a super-2 number, since 2×19447116243681² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19447116243689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19855965 + ... + 20812341.

It is an arithmetic number, because the mean of its divisors is an integer number (928019479544).

Almost surely, 2^{19447116243681} is an apocalyptic number.

It is an amenable number.

19447116243681 is a deficient number, since it is larger than the sum of its proper divisors (10249507101727).

19447116243681 is a wasteful number, since it uses less digits than its factorization.

19447116243681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 958441.

The product of its digits is 6967296, while the sum is 57.

The spelling of 19447116243681 in words is "nineteen trillion, four hundred forty-seven billion, one hundred sixteen million, two hundred forty-three thousand, six hundred eighty-one".