1681042340168 has 16 divisors (see below), whose sum is σ = 3151983685500. Its totient is φ = 840513357376.

The previous prime is 1681042340149. The next prime is 1681042340171. The reversal of 1681042340168 is 8610432401861.

It can be written as a sum of positive squares in 2 ways, for example, as 1539788137924 + 141254202244 = 1240882^2 + 375838^2 .

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, 5303 + ... + 1833606.

Almost surely, 2^{1681042340168} is an apocalyptic number.

It is an amenable number.

1681042340168 is a deficient number, since it is larger than the sum of its proper divisors (1470941345332).

1681042340168 is a wasteful number, since it uses less digits than its factorization.

1681042340168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1953184 (or 1953180 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 44.

The spelling of 1681042340168 in words is "one trillion, six hundred eighty-one billion, forty-two million, three hundred forty thousand, one hundred sixty-eight".