686430565 has 4 divisors (see below), whose sum is σ = 823716684. Its totient is φ = 549144448.

The previous prime is 686430559. The next prime is 686430571. The reversal of 686430565 is 565034686.

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 (686430559) and next prime (686430571).

It can be written as a sum of positive squares in 2 ways, for example, as 527115681 + 159314884 = 22959^2 + 12622^2 .

It is a cyclic number.

It is not a de Polignac number, because 686430565 - 2¹¹ = 686428517 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 68643052 + ... + 68643061.

It is an arithmetic number, because the mean of its divisors is an integer number (205929171).

Almost surely, 2^686430565 is an apocalyptic number.

It is an amenable number.

686430565 is a deficient number, since it is larger than the sum of its proper divisors (137286119).

686430565 is a wasteful number, since it uses less digits than its factorization.

686430565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137286118.

The product of its (nonzero) digits is 518400, while the sum is 43.

The square root of 686430565 is about 26199.8199421294. The cubic root of 686430565 is about 882.1292126311.

The spelling of 686430565 in words is "six hundred eighty-six million, four hundred thirty thousand, five hundred sixty-five".