780216865839 has 16 divisors (see below), whose sum is σ = 1162262905440. Its totient is φ = 517270847040.

The previous prime is 780216865823. The next prime is 780216865843. The reversal of 780216865839 is 938568612087.

It is not a de Polignac number, because 780216865839 - 2⁴ = 780216865823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (780216865859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79820862 + ... + 79830635.

It is an arithmetic number, because the mean of its divisors is an integer number (72641431590).

Almost surely, 2^780216865839 is an apocalyptic number.

780216865839 is a deficient number, since it is larger than the sum of its proper divisors (382046039601).

780216865839 is a wasteful number, since it uses less digits than its factorization.

780216865839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159651687 (or 159651681 counting only the distinct ones).

The product of its (nonzero) digits is 34836480, while the sum is 63.

The spelling of 780216865839 in words is "seven hundred eighty billion, two hundred sixteen million, eight hundred sixty-five thousand, eight hundred thirty-nine".