686365649 has 4 divisors (see below), whose sum is σ = 710033460. Its totient is φ = 662697840.

The previous prime is 686365643. The next prime is 686365657. The reversal of 686365649 is 946563686.

686365649 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 288762049 + 397603600 = 16993^2 + 19940^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686365649 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 686365649.

It is not an unprimeable number, because it can be changed into a prime (686365643) 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, 11833862 + ... + 11833919.

It is an arithmetic number, because the mean of its divisors is an integer number (177508365).

Almost surely, 2^686365649 is an apocalyptic number.

It is an amenable number.

686365649 is a deficient number, since it is larger than the sum of its proper divisors (23667811).

686365649 is a wasteful number, since it uses less digits than its factorization.

686365649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23667810.

The product of its digits is 5598720, while the sum is 53.

The square root of 686365649 is about 26198.5810493622. The cubic root of 686365649 is about 882.1014039892.

The spelling of 686365649 in words is "six hundred eighty-six million, three hundred sixty-five thousand, six hundred forty-nine".