781713889439 has 12 divisors (see below), whose sum is σ = 949030804464. Its totient is φ = 630626329344.

The previous prime is 781713889421. The next prime is 781713889447. The reversal of 781713889439 is 934988317187.

781713889439 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 781713889439 - 2⁸ = 781713889183 is a prime.

It is a super-2 number, since 2×781713889439² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (781713880439) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 193204574 + ... + 193208619.

It is an arithmetic number, because the mean of its divisors is an integer number (79085900372).

Almost surely, 2^781713889439 is an apocalyptic number.

781713889439 is a deficient number, since it is larger than the sum of its proper divisors (167316915025).

781713889439 is a wasteful number, since it uses less digits than its factorization.

781713889439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386413234 (or 386413217 counting only the distinct ones).

The product of its digits is 73156608, while the sum is 68.

The spelling of 781713889439 in words is "seven hundred eighty-one billion, seven hundred thirteen million, eight hundred eighty-nine thousand, four hundred thirty-nine".