689640558916 has 27 divisors (see below), whose sum is σ = 1212052215549. Its totient is φ = 343346237808.

The previous prime is 689640558863. The next prime is 689640558931. The reversal of 689640558916 is 619855046986.

The square root of 689640558916 is 830446.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 118866352900 + 570774206016 = 344770^2 + 755496^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 460066335 + ... + 460067833.

Almost surely, 2^689640558916 is an apocalyptic number.

689640558916 is the 830446-th square number.

It is an amenable number.

689640558916 is a deficient number, since it is larger than the sum of its proper divisors (522411656633).

689640558916 is an frugal number, since it uses more digits than its factorization.

689640558916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3556 (or 1778 counting only the distinct ones).

The product of its (nonzero) digits is 111974400, while the sum is 67.

The spelling of 689640558916 in words is "six hundred eighty-nine billion, six hundred forty million, five hundred fifty-eight thousand, nine hundred sixteen".