689326686049 has 3 divisors (see below), whose sum is σ = 689327516307. Its totient is φ = 689325855792.

The previous prime is 689326686019. The next prime is 689326686053. The reversal of 689326686049 is 940686623986.

The square root of 689326686049 is 830257.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 88652085025 + 600674601024 = 297745^2 + 775032^2 .

It is not a de Polignac number, because 689326686049 - 2⁷ = 689326685921 is a prime.

It is a super-2 number, since 2×689326686049² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (689326686019) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 415129 + ... + 1245385.

It is an arithmetic number, because the mean of its divisors is an integer number (229775838769).

Almost surely, 2^689326686049 is an apocalyptic number.

689326686049 is the 830257-th square number.

689326686049 is the 415129-th centered octagonal number.

It is an amenable number.

689326686049 is a deficient number, since it is larger than the sum of its proper divisors (830258).

689326686049 is an frugal number, since it uses more digits than its factorization.

689326686049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1660514 (or 830257 counting only the distinct ones).

The product of its (nonzero) digits is 161243136, while the sum is 67.

The spelling of 689326686049 in words is "six hundred eighty-nine billion, three hundred twenty-six million, six hundred eighty-six thousand, forty-nine".