1681986666682 has 8 divisors (see below), whose sum is σ = 2883405714336. Its totient is φ = 720851428572.

The previous prime is 1681986666677. The next prime is 1681986666691. The reversal of 1681986666682 is 2866666891861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60070952368 + ... + 60070952395.

It is an arithmetic number, because the mean of its divisors is an integer number (360425714292).

Almost surely, 2^{1681986666682} is an apocalyptic number.

1681986666682 is a deficient number, since it is larger than the sum of its proper divisors (1201419047654).

1681986666682 is a wasteful number, since it uses less digits than its factorization.

1681986666682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120141904772.

The product of its digits is 429981696, while the sum is 73.

The spelling of 1681986666682 in words is "one trillion, six hundred eighty-one billion, nine hundred eighty-six million, six hundred sixty-six thousand, six hundred eighty-two".