779286500065 has 4 divisors (see below), whose sum is σ = 935143800084. Its totient is φ = 623429200048.

The previous prime is 779286500009. The next prime is 779286500077. The reversal of 779286500065 is 560005682977.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 560005682977 = 13 ⋅43077360229.

It can be written as a sum of positive squares in 2 ways, for example, as 489462547456 + 289823952609 = 699616^2 + 538353^2 .

It is a cyclic number.

It is not a de Polignac number, because 779286500065 - 2⁹ = 779286499553 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 779286499979 and 779286500015.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77928650002 + ... + 77928650011.

It is an arithmetic number, because the mean of its divisors is an integer number (233785950021).

Almost surely, 2^779286500065 is an apocalyptic number.

It is an amenable number.

779286500065 is a deficient number, since it is larger than the sum of its proper divisors (155857300019).

779286500065 is a wasteful number, since it uses less digits than its factorization.

779286500065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155857300018.

The product of its (nonzero) digits is 6350400, while the sum is 55.

The spelling of 779286500065 in words is "seven hundred seventy-nine billion, two hundred eighty-six million, five hundred thousand, sixty-five".