689942838498169 has 27 divisors (see below), whose sum is σ = 699328956017293. Its totient is φ = 680682359868704.

The previous prime is 689942838498167. The next prime is 689942838498241. The reversal of 689942838498169 is 961894838249986.

The square root of 689942838498169 is 26266763.

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

It can be written as a sum of positive squares in 4 ways, for example, as 1337642599225 + 688605195898944 = 1156565^2 + 26241288^2 .

It is not a de Polignac number, because 689942838498169 - 2¹ = 689942838498167 is a prime.

It is a super-2 number, since 2×689942838498169² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (689942838498167) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 677078349342 + ... + 677078350360.

Almost surely, 2^{689942838498169} is an apocalyptic number.

689942838498169 is the 26266763-rd square number.

689942838498169 is the 13133382-nd centered octagonal number.

It is an amenable number.

689942838498169 is a deficient number, since it is larger than the sum of its proper divisors (9386117519124).

689942838498169 is an frugal number, since it uses more digits than its factorization.

689942838498169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2682 (or 1341 counting only the distinct ones).

The product of its digits is 92876046336, while the sum is 94.

The spelling of 689942838498169 in words is "six hundred eighty-nine trillion, nine hundred forty-two billion, eight hundred thirty-eight million, four hundred ninety-eight thousand, one hundred sixty-nine".