1681861512384 has 42 divisors (see below), whose sum is σ = 4820752357460. Its totient is φ = 560620503936.

The previous prime is 1681861512379. The next prime is 1681861512439. The reversal of 1681861512384 is 4832151681861.

1681861512384 is a `hidden beast` number, since 1 + 6 + 8 + 1 + 8 + 615 + 12 + 3 + 8 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1681861512384.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1459948654 + ... + 1459949805.

Almost surely, 2^{1681861512384} is an apocalyptic number.

It is an amenable number.

1681861512384 is an abundant number, since it is smaller than the sum of its proper divisors (3138890845076).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1681861512384 is a wasteful number, since it uses less digits than its factorization.

1681861512384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2919898477 (or 2919898464 counting only the distinct ones).

The product of its digits is 2211840, while the sum is 54.

The spelling of 1681861512384 in words is "one trillion, six hundred eighty-one billion, eight hundred sixty-one million, five hundred twelve thousand, three hundred eighty-four".