19963831439639 has 8 divisors (see below), whose sum is σ = 20608047891072. Its totient is φ = 19319628856320.

The previous prime is 19963831439627. The next prime is 19963831439711. The reversal of 19963831439639 is 93693413836991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19963831439639 - 2²⁸ = 19963563004183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19963831439339) 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 7 ways as a sum of consecutive naturals, for example, 501194 + ... + 6338679.

It is an arithmetic number, because the mean of its divisors is an integer number (2576005986384).

Almost surely, 2^{19963831439639} is an apocalyptic number.

19963831439639 is a deficient number, since it is larger than the sum of its proper divisors (644216451433).

19963831439639 is an equidigital number, since it uses as much as digits as its factorization.

19963831439639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6934057.

The product of its digits is 612220032, while the sum is 74.

The spelling of 19963831439639 in words is "nineteen trillion, nine hundred sixty-three billion, eight hundred thirty-one million, four hundred thirty-nine thousand, six hundred thirty-nine".