689617655 has 8 divisors (see below), whose sum is σ = 849907392. Its totient is φ = 536783328.

The previous prime is 689617613. The next prime is 689617681. The reversal of 689617655 is 556716986.

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

It is a cyclic number.

It is not a de Polignac number, because 689617655 - 2¹² = 689613559 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 689617597 and 689617606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1863647 + ... + 1864016.

It is an arithmetic number, because the mean of its divisors is an integer number (106238424).

Almost surely, 2^689617655 is an apocalyptic number.

689617655 is a deficient number, since it is larger than the sum of its proper divisors (160289737).

689617655 is a wasteful number, since it uses less digits than its factorization.

689617655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3727705.

The product of its digits is 2721600, while the sum is 53.

The square root of 689617655 is about 26260.5722519522. The cubic root of 689617655 is about 883.4923440654.

The spelling of 689617655 in words is "six hundred eighty-nine million, six hundred seventeen thousand, six hundred fifty-five".