1681203957696 has 140 divisors (see below), whose sum is σ = 5012424902232. Its totient is φ = 557161708032.

The previous prime is 1681203957619. The next prime is 1681203957703. The reversal of 1681203957696 is 6967593021861.

1681203957696 is a `hidden beast` number, since 1 + 6 + 8 + 1 + 20 + 39 + 576 + 9 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 40470 + ... + 1834133.

Almost surely, 2^{1681203957696} is an apocalyptic number.

1681203957696 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1681203957696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2506212451116).

1681203957696 is an abundant number, since it is smaller than the sum of its proper divisors (3331220944536).

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

1681203957696 is a wasteful number, since it uses less digits than its factorization.

1681203957696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1874800 (or 1874781 counting only the distinct ones).

The product of its (nonzero) digits is 29393280, while the sum is 63.

The spelling of 1681203957696 in words is "one trillion, six hundred eighty-one billion, two hundred three million, nine hundred fifty-seven thousand, six hundred ninety-six".