779724381213 has 18 divisors (see below), whose sum is σ = 1188665705214. Its totient is φ = 492457501872.

The previous prime is 779724381209. The next prime is 779724381223. The reversal of 779724381213 is 312183427977.

It can be written as a sum of positive squares in only one way, i.e., 779666042169 + 58339044 = 882987^2 + 7638^2 .

It is not a de Polignac number, because 779724381213 - 2² = 779724381209 is a prime.

It is a super-2 number, since 2×779724381213² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 779724381213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (779724381223) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 119991270 + ... + 119997767.

It is an arithmetic number, because the mean of its divisors is an integer number (66036983623).

Almost surely, 2^779724381213 is an apocalyptic number.

It is an amenable number.

779724381213 is a deficient number, since it is larger than the sum of its proper divisors (408941324001).

779724381213 is a wasteful number, since it uses less digits than its factorization.

779724381213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239989081 (or 239989059 counting only the distinct ones).

The product of its digits is 3556224, while the sum is 54.

The spelling of 779724381213 in words is "seven hundred seventy-nine billion, seven hundred twenty-four million, three hundred eighty-one thousand, two hundred thirteen".