1680172168565 has 16 divisors (see below), whose sum is σ = 2315261171520. Its totient is φ = 1157630584320.

The previous prime is 1680172168561. The next prime is 1680172168583. The reversal of 1680172168565 is 5658612710861.

It is not a de Polignac number, because 1680172168565 - 2² = 1680172168561 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1680172168565.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1680172168561) 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 15 ways as a sum of consecutive naturals, for example, 803909084 + ... + 803911173.

It is an arithmetic number, because the mean of its divisors is an integer number (144703823220).

Almost surely, 2^{1680172168565} is an apocalyptic number.

It is an amenable number.

1680172168565 is a deficient number, since it is larger than the sum of its proper divisors (635089002955).

1680172168565 is a wasteful number, since it uses less digits than its factorization.

1680172168565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1607820292.

The product of its (nonzero) digits is 4838400, while the sum is 56.

The spelling of 1680172168565 in words is "one trillion, six hundred eighty billion, one hundred seventy-two million, one hundred sixty-eight thousand, five hundred sixty-five".