681471999999 has 24 divisors (see below), whose sum is σ = 1127654586240. Its totient is φ = 388483170768.

The previous prime is 681471999953. The next prime is 681472000037. The reversal of 681471999999 is 999999174186.

It is a happy number.

It is a Cunningham number, because it is equal to 8800³-1.

It is not a de Polignac number, because 681471999999 - 2¹² = 681471995903 is a prime.

681471999999 is a modest number, since divided by 999999 gives 681471 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681471991999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12881737 + ... + 12934530.

It is an arithmetic number, because the mean of its divisors is an integer number (46985607760).

Almost surely, 2^681471999999 is an apocalyptic number.

681471999999 is a deficient number, since it is larger than the sum of its proper divisors (446182586241).

681471999999 is a wasteful number, since it uses less digits than its factorization.

681471999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25816699 (or 25816696 counting only the distinct ones).

The product of its digits is 714256704, while the sum is 81.

The spelling of 681471999999 in words is "six hundred eighty-one billion, four hundred seventy-one million, nine hundred ninety-nine thousand, nine hundred ninety-nine".