165894243696 has 640 divisors, whose sum is σ = 541374873600. Its totient is φ = 48406533120.

The previous prime is 165894243689. The next prime is 165894243707. The reversal of 165894243696 is 696342498561.

165894243696 is a `hidden beast` number, since 1 + 6 + 589 + 4 + 2 + 43 + 6 + 9 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 630776461 + ... + 630776723.

It is an arithmetic number, because the mean of its divisors is an integer number (845898240).

Almost surely, 2^165894243696 is an apocalyptic number.

165894243696 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 165894243696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (270687436800).

165894243696 is an abundant number, since it is smaller than the sum of its proper divisors (375480629904).

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

165894243696 is a wasteful number, since it uses less digits than its factorization.

165894243696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434 (or 422 counting only the distinct ones).

The product of its digits is 67184640, while the sum is 63.

The spelling of 165894243696 in words is "one hundred sixty-five billion, eight hundred ninety-four million, two hundred forty-three thousand, six hundred ninety-six".