681407888372 has 24 divisors (see below), whose sum is σ = 1194491188800. Its totient is φ = 340125160256.

The previous prime is 681407888351. The next prime is 681407888377. The reversal of 681407888372 is 273888704186.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681407888377) 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, 5885579 + ... + 6000237.

It is an arithmetic number, because the mean of its divisors is an integer number (49770466200).

Almost surely, 2^681407888372 is an apocalyptic number.

It is an amenable number.

681407888372 is a deficient number, since it is larger than the sum of its proper divisors (513083300428).

681407888372 is a wasteful number, since it uses less digits than its factorization.

681407888372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117175 (or 117173 counting only the distinct ones).

The product of its (nonzero) digits is 28901376, while the sum is 62.

The spelling of 681407888372 in words is "six hundred eighty-one billion, four hundred seven million, eight hundred eighty-eight thousand, three hundred seventy-two".