689689986985 has 8 divisors (see below), whose sum is σ = 828261219456. Its totient is φ = 551329832880.

The previous prime is 689689986949. The next prime is 689689987031. The reversal of 689689986985 is 589689986986.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 689689986985 - 2¹³ = 689689978793 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 689689986985.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52762401 + ... + 52775470.

It is an arithmetic number, because the mean of its divisors is an integer number (103532652432).

Almost surely, 2^689689986985 is an apocalyptic number.

It is an amenable number.

689689986985 is a deficient number, since it is larger than the sum of its proper divisors (138571232471).

689689986985 is a wasteful number, since it uses less digits than its factorization.

689689986985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105539183.

The product of its digits is 29023764480, while the sum is 91.

Subtracting from 689689986985 its reverse (589689986986), we obtain a palindrome (99999999999).

The spelling of 689689986985 in words is "six hundred eighty-nine billion, six hundred eighty-nine million, nine hundred eighty-six thousand, nine hundred eighty-five".