781839554313 has 16 divisors (see below), whose sum is σ = 1112350441280. Its totient is φ = 487029106944.

The previous prime is 781839554311. The next prime is 781839554347. The reversal of 781839554313 is 313455938187.

It is not a de Polignac number, because 781839554313 - 2¹ = 781839554311 is a prime.

It is a super-2 number, since 2×781839554313² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (781839554311) 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 15 ways as a sum of consecutive naturals, for example, 93944356 + ... + 93952677.

It is an arithmetic number, because the mean of its divisors is an integer number (69521902580).

Almost surely, 2^781839554313 is an apocalyptic number.

781839554313 is a gapful number since it is divisible by the number (73) formed by its first and last digit.

It is an amenable number.

781839554313 is a deficient number, since it is larger than the sum of its proper divisors (330510886967).

781839554313 is a wasteful number, since it uses less digits than its factorization.

781839554313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187897128.

The product of its digits is 10886400, while the sum is 57.

The spelling of 781839554313 in words is "seven hundred eighty-one billion, eight hundred thirty-nine million, five hundred fifty-four thousand, three hundred thirteen".