681237342721 has 8 divisors (see below), whose sum is σ = 743973177024. Its totient is φ = 619977645840.

The previous prime is 681237342713. The next prime is 681237342727. The reversal of 681237342721 is 127243732186.

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 681237342721 - 2³ = 681237342713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681237342727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 369033391 + ... + 369035236.

It is an arithmetic number, because the mean of its divisors is an integer number (92996647128).

Almost surely, 2^681237342721 is an apocalyptic number.

It is an amenable number.

681237342721 is a deficient number, since it is larger than the sum of its proper divisors (62735834303).

681237342721 is a wasteful number, since it uses less digits than its factorization.

681237342721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 738068711.

The product of its digits is 677376, while the sum is 46.

The spelling of 681237342721 in words is "six hundred eighty-one billion, two hundred thirty-seven million, three hundred forty-two thousand, seven hundred twenty-one".