681608359725 has 24 divisors (see below), whose sum is σ = 1175922599232. Its totient is φ = 347719046400.

The previous prime is 681608359709. The next prime is 681608359807. The reversal of 681608359725 is 527953806186.

It is not a de Polignac number, because 681608359725 - 2⁴ = 681608359709 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 197565916 + ... + 197569365.

It is an arithmetic number, because the mean of its divisors is an integer number (48996774968).

Almost surely, 2^681608359725 is an apocalyptic number.

It is an amenable number.

681608359725 is a deficient number, since it is larger than the sum of its proper divisors (494314239507).

681608359725 is a wasteful number, since it uses less digits than its factorization.

681608359725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395135317 (or 395135312 counting only the distinct ones).

The product of its (nonzero) digits is 21772800, while the sum is 60.

The spelling of 681608359725 in words is "six hundred eighty-one billion, six hundred eight million, three hundred fifty-nine thousand, seven hundred twenty-five".