786644661065 has 4 divisors (see below), whose sum is σ = 943973593284. Its totient is φ = 629315728848.

The previous prime is 786644661059. The next prime is 786644661071. The reversal of 786644661065 is 560166446687.

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

It is an interprime number because it is at equal distance from previous prime (786644661059) and next prime (786644661071).

It can be written as a sum of positive squares in 2 ways, for example, as 239955961609 + 546688699456 = 489853^2 + 739384^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-786644661065 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 786644660995 and 786644661013.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78664466102 + ... + 78664466111.

It is an arithmetic number, because the mean of its divisors is an integer number (235993398321).

Almost surely, 2^786644661065 is an apocalyptic number.

It is an amenable number.

786644661065 is a deficient number, since it is larger than the sum of its proper divisors (157328932219).

786644661065 is a wasteful number, since it uses less digits than its factorization.

786644661065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157328932218.

The product of its (nonzero) digits is 34836480, while the sum is 59.

The spelling of 786644661065 in words is "seven hundred eighty-six billion, six hundred forty-four million, six hundred sixty-one thousand, sixty-five".