681388054909 has 8 divisors (see below), whose sum is σ = 685175036000. Its totient is φ = 677601320400.

The previous prime is 681388054903. The next prime is 681388054937. The reversal of 681388054909 is 909450883186.

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 681388054909 - 2⁵ = 681388054877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681388054903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10213342 + ... + 10279840.

It is an arithmetic number, because the mean of its divisors is an integer number (85646879500).

Almost surely, 2^681388054909 is an apocalyptic number.

It is an amenable number.

681388054909 is a deficient number, since it is larger than the sum of its proper divisors (3786981091).

681388054909 is a wasteful number, since it uses less digits than its factorization.

681388054909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123291.

The product of its (nonzero) digits is 14929920, while the sum is 61.

The spelling of 681388054909 in words is "six hundred eighty-one billion, three hundred eighty-eight million, fifty-four thousand, nine hundred nine".