681569832409 has 8 divisors (see below), whose sum is σ = 700975144800. Its totient is φ = 662296980000.

The previous prime is 681569832389. The next prime is 681569832413. The reversal of 681569832409 is 904238965186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 681569832409 - 2¹⁵ = 681569799641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681569832439) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33104559 + ... + 33125140.

It is an arithmetic number, because the mean of its divisors is an integer number (87621893100).

Almost surely, 2^681569832409 is an apocalyptic number.

It is an amenable number.

681569832409 is a deficient number, since it is larger than the sum of its proper divisors (19405312391).

681569832409 is a wasteful number, since it uses less digits than its factorization.

681569832409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66229991.

The product of its (nonzero) digits is 22394880, while the sum is 61.

The spelling of 681569832409 in words is "six hundred eighty-one billion, five hundred sixty-nine million, eight hundred thirty-two thousand, four hundred nine".