681900636344 has 32 divisors (see below), whose sum is σ = 1349669250000. Its totient is φ = 322090509312.

The previous prime is 681900636343. The next prime is 681900636371. The reversal of 681900636344 is 443636009186.

It is a junction number, because it is equal to n+sod(n) for n = 681900636292 and 681900636301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681900636341) 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, 6300719 + ... + 6408030.

Almost surely, 2^681900636344 is an apocalyptic number.

It is an amenable number.

681900636344 is a deficient number, since it is larger than the sum of its proper divisors (667768613656).

681900636344 is a wasteful number, since it uses less digits than its factorization.

681900636344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12709127 (or 12709123 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 50.

The spelling of 681900636344 in words is "six hundred eighty-one billion, nine hundred million, six hundred thirty-six thousand, three hundred forty-four".