689095590985 has 4 divisors (see below), whose sum is σ = 826914709188. Its totient is φ = 551276472784.

The previous prime is 689095590979. The next prime is 689095591021. The reversal of 689095590985 is 589095590986.

It is a happy number.

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 506784524544 + 182311066441 = 711888^2 + 426979^2 .

It is a cyclic number.

It is not a de Polignac number, because 689095590985 - 2³¹ = 686948107337 is a prime.

It is a Duffinian 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, 68909559094 + ... + 68909559103.

It is an arithmetic number, because the mean of its divisors is an integer number (206728677297).

Almost surely, 2^689095590985 is an apocalyptic number.

It is an amenable number.

689095590985 is a deficient number, since it is larger than the sum of its proper divisors (137819118203).

689095590985 is a wasteful number, since it uses less digits than its factorization.

689095590985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137819118202.

The product of its (nonzero) digits is 314928000, while the sum is 73.

Subtracting from 689095590985 its reverse (589095590986), we obtain a palindrome (99999999999).

The spelling of 689095590985 in words is "six hundred eighty-nine billion, ninety-five million, five hundred ninety thousand, nine hundred eighty-five".