81683165896704 has 168 divisors, whose sum is σ = 241714298767032. Its totient is φ = 26563630202880.

The previous prime is 81683165896649. The next prime is 81683165896793. The reversal of 81683165896704 is 40769856138618.

81683165896704 is a `hidden beast` number, since 8 + 1 + 6 + 8 + 31 + 6 + 589 + 6 + 7 + 0 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10488114 + ... + 16533809.

It is an arithmetic number, because the mean of its divisors is an integer number (1438775587899).

Almost surely, 2^{81683165896704} is an apocalyptic number.

It is an amenable number.

81683165896704 is an abundant number, since it is smaller than the sum of its proper divisors (160031132870328).

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

81683165896704 is a wasteful number, since it uses less digits than its factorization.

81683165896704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27021996 (or 27021969 counting only the distinct ones).

The product of its (nonzero) digits is 418037760, while the sum is 72.

The spelling of 81683165896704 in words is "eighty-one trillion, six hundred eighty-three billion, one hundred sixty-five million, eight hundred ninety-six thousand, seven hundred four".