1689666721516 has 12 divisors (see below), whose sum is σ = 2957511391632. Its totient is φ = 844663466768.

The previous prime is 1689666721499. The next prime is 1689666721537. The reversal of 1689666721516 is 6151276669861.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42451120 + ... + 42490903.

It is an arithmetic number, because the mean of its divisors is an integer number (246459282636).

Almost surely, 2^{1689666721516} is an apocalyptic number.

It is an amenable number.

1689666721516 is a deficient number, since it is larger than the sum of its proper divisors (1267844670116).

1689666721516 is a wasteful number, since it uses less digits than its factorization.

1689666721516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84947000 (or 84946998 counting only the distinct ones).

The product of its digits is 39191040, while the sum is 64.

The spelling of 1689666721516 in words is "one trillion, six hundred eighty-nine billion, six hundred sixty-six million, seven hundred twenty-one thousand, five hundred sixteen".