1689643168969 has 4 divisors (see below), whose sum is σ = 1931020764544. Its totient is φ = 1448265573396.

The previous prime is 1689643168951. The next prime is 1689643169003. The reversal of 1689643168969 is 9698613469861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1689643168969 - 2¹⁹ = 1689642644681 is a prime.

It is a super-2 number, since 2×1689643168969² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1689643168895 and 1689643168904.

It is not an unprimeable number, because it can be changed into a prime (1689643168469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120688797777 + ... + 120688797790.

It is an arithmetic number, because the mean of its divisors is an integer number (482755191136).

Almost surely, 2^{1689643168969} is an apocalyptic number.

It is an amenable number.

1689643168969 is a deficient number, since it is larger than the sum of its proper divisors (241377595575).

1689643168969 is an equidigital number, since it uses as much as digits as its factorization.

1689643168969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241377595574.

The product of its digits is 725594112, while the sum is 76.

The spelling of 1689643168969 in words is "one trillion, six hundred eighty-nine billion, six hundred forty-three million, one hundred sixty-eight thousand, nine hundred sixty-nine".