1681946872956 has 96 divisors (see below), whose sum is σ = 4984341824000. Its totient is φ = 480479537664.

The previous prime is 1681946872939. The next prime is 1681946872961. The reversal of 1681946872956 is 6592786491861.

1681946872956 is a `hidden beast` number, since 1 + 6 + 8 + 1 + 9 + 468 + 72 + 95 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4648140 + ... + 4996908.

Almost surely, 2^{1681946872956} is an apocalyptic number.

It is an amenable number.

1681946872956 is an abundant number, since it is smaller than the sum of its proper divisors (3302394951044).

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

1681946872956 is a wasteful number, since it uses less digits than its factorization.

1681946872956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355168 (or 355160 counting only the distinct ones).

The product of its digits is 313528320, while the sum is 72.

The spelling of 1681946872956 in words is "one trillion, six hundred eighty-one billion, nine hundred forty-six million, eight hundred seventy-two thousand, nine hundred fifty-six".