689656565 has 16 divisors (see below), whose sum is σ = 892996608. Its totient is φ = 508286016.

The previous prime is 689656553. The next prime is 689656571. The reversal of 689656565 is 565656986.

It is a cyclic number.

It is not a de Polignac number, because 689656565 - 2⁴ = 689656549 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 689656565.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23852 + ... + 44138.

It is an arithmetic number, because the mean of its divisors is an integer number (55812288).

Almost surely, 2^689656565 is an apocalyptic number.

689656565 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

689656565 is a deficient number, since it is larger than the sum of its proper divisors (203340043).

689656565 is a wasteful number, since it uses less digits than its factorization.

689656565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20828.

The product of its digits is 11664000, while the sum is 56.

The square root of 689656565 is about 26261.3130859826. The cubic root of 689656565 is about 883.5089600556.

The spelling of 689656565 in words is "six hundred eighty-nine million, six hundred fifty-six thousand, five hundred sixty-five".