681681358423 has 8 divisors (see below), whose sum is σ = 737190014400. Its totient is φ = 626611506528.

The previous prime is 681681358417. The next prime is 681681358451. The reversal of 681681358423 is 324853186186.

It is a happy number.

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 681681358423 - 2³³ = 673091423831 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 (681681058423) 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, 109697788 + ... + 109704001.

It is an arithmetic number, because the mean of its divisors is an integer number (92148751800).

Almost surely, 2^681681358423 is an apocalyptic number.

681681358423 is a deficient number, since it is larger than the sum of its proper divisors (55508655977).

681681358423 is a wasteful number, since it uses less digits than its factorization.

681681358423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219402041.

The product of its digits is 6635520, while the sum is 55.

The spelling of 681681358423 in words is "six hundred eighty-one billion, six hundred eighty-one million, three hundred fifty-eight thousand, four hundred twenty-three".