779117485381 has 4 divisors (see below), whose sum is σ = 779120378764. Its totient is φ = 779114592000.

The previous prime is 779117485369. The next prime is 779117485397. The reversal of 779117485381 is 183584711977.

It is a happy number.

779117485381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 623995724356 + 155121761025 = 789934^2 + 393855^2 .

It is a cyclic number.

It is not a de Polignac number, because 779117485381 - 2⁹ = 779117484869 is a prime.

It is a super-2 number, since 2×779117485381² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (779117485681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 995970 + ... + 1596931.

It is an arithmetic number, because the mean of its divisors is an integer number (194780094691).

Almost surely, 2^779117485381 is an apocalyptic number.

It is an amenable number.

779117485381 is a deficient number, since it is larger than the sum of its proper divisors (2893383).

779117485381 is a wasteful number, since it uses less digits than its factorization.

779117485381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2893382.

The product of its digits is 11854080, while the sum is 61.

The spelling of 779117485381 in words is "seven hundred seventy-nine billion, one hundred seventeen million, four hundred eighty-five thousand, three hundred eighty-one".