689017914665 has 16 divisors (see below), whose sum is σ = 829360131600. Its totient is φ = 549522247680.

The previous prime is 689017914653. The next prime is 689017914721. The reversal of 689017914665 is 566419710986.

It can be written as a sum of positive squares in 8 ways, for example, as 183811127824 + 505206786841 = 428732^2 + 710779^2 .

It is not a de Polignac number, because 689017914665 - 2¹² = 689017910569 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 689017914598 and 689017914607.

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, 25849745 + ... + 25876385.

It is an arithmetic number, because the mean of its divisors is an integer number (51835008225).

Almost surely, 2^689017914665 is an apocalyptic number.

It is an amenable number.

689017914665 is a deficient number, since it is larger than the sum of its proper divisors (140342216935).

689017914665 is a wasteful number, since it uses less digits than its factorization.

689017914665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42332.

The product of its (nonzero) digits is 19595520, while the sum is 62.

The spelling of 689017914665 in words is "six hundred eighty-nine billion, seventeen million, nine hundred fourteen thousand, six hundred sixty-five".