781886865772 has 12 divisors (see below), whose sum is σ = 1384787582136. Its totient is φ = 386233270880.

The previous prime is 781886865751. The next prime is 781886865779. The reversal of 781886865772 is 277568688187.

It is a super-2 number, since 2×781886865772² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 781886865695 and 781886865704.

It is not an unprimeable number, because it can be changed into a prime (781886865779) 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 3 ways as a sum of consecutive naturals, for example, 1177540129 + ... + 1177540792.

It is an arithmetic number, because the mean of its divisors is an integer number (115398965178).

Almost surely, 2^781886865772 is an apocalyptic number.

It is an amenable number.

781886865772 is a deficient number, since it is larger than the sum of its proper divisors (602900716364).

781886865772 is a wasteful number, since it uses less digits than its factorization.

781886865772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2355081008 (or 2355081006 counting only the distinct ones).

The product of its digits is 505774080, while the sum is 73.

The spelling of 781886865772 in words is "seven hundred eighty-one billion, eight hundred eighty-six million, eight hundred sixty-five thousand, seven hundred seventy-two".