778119816321 has 27 divisors (see below), whose sum is σ = 1129023080289. Its totient is φ = 516416006952.

The previous prime is 778119816319. The next prime is 778119816329. The reversal of 778119816321 is 123618911877.

The square root of 778119816321 is 882111.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 778119816321 - 2¹ = 778119816319 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (778119816329) 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 26 ways as a sum of consecutive naturals, for example, 748911720 + ... + 748912758.

Almost surely, 2^778119816321 is an apocalyptic number.

778119816321 is the 882111-st square number.

778119816321 is the 441056-th centered octagonal number.

It is an amenable number.

778119816321 is a deficient number, since it is larger than the sum of its proper divisors (350903263968).

778119816321 is an frugal number, since it uses more digits than its factorization.

778119816321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2650 (or 1325 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 54.

The spelling of 778119816321 in words is "seven hundred seventy-eight billion, one hundred nineteen million, eight hundred sixteen thousand, three hundred twenty-one".