689065565 has 4 divisors (see below), whose sum is σ = 826878684. Its totient is φ = 551252448.

The previous prime is 689065529. The next prime is 689065567. The reversal of 689065565 is 565560986.

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 88717561 + 600348004 = 9419^2 + 24502^2 .

It is a cyclic number.

It is not a de Polignac number, because 689065565 - 2¹² = 689061469 is a prime.

It is a super-2 number, since 2×689065565² = 949622705737538450, which 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 (689065567) 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, 68906552 + ... + 68906561.

It is an arithmetic number, because the mean of its divisors is an integer number (206719671).

Almost surely, 2^689065565 is an apocalyptic number.

It is an amenable number.

689065565 is a deficient number, since it is larger than the sum of its proper divisors (137813119).

689065565 is a wasteful number, since it uses less digits than its factorization.

689065565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137813118.

The product of its (nonzero) digits is 1944000, while the sum is 50.

The square root of 689065565 is about 26250.0583808875. The cubic root of 689065565 is about 883.2565141060.

The spelling of 689065565 in words is "six hundred eighty-nine million, sixty-five thousand, five hundred sixty-five".