1709668696849 has 9 divisors (see below), whose sum is σ = 1757174527227. Its totient is φ = 1663414363224.

The previous prime is 1709668696847. The next prime is 1709668696859. The reversal of 1709668696849 is 9486968669071.

The square root of 1709668696849 is 1307543.

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., 1529835028225 + 179833668624 = 1236865^2 + 424068^2 .

It is not a de Polignac number, because 1709668696849 - 2¹ = 1709668696847 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1709668696843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 48361422 + ... + 48396760.

Almost surely, 2^{1709668696849} is an apocalyptic number.

1709668696849 is the 1307543-rd square number.

1709668696849 is the 653772-nd centered octagonal number.

It is an amenable number.

1709668696849 is a deficient number, since it is larger than the sum of its proper divisors (47505830378).

1709668696849 is an frugal number, since it uses more digits than its factorization.

1709668696849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70752 (or 35376 counting only the distinct ones).

The product of its (nonzero) digits is 1693052928, while the sum is 79.

The spelling of 1709668696849 in words is "one trillion, seven hundred nine billion, six hundred sixty-eight million, six hundred ninety-six thousand, eight hundred forty-nine".