681517417850 has 12 divisors (see below), whose sum is σ = 1267622397294. Its totient is φ = 272606967120.

The previous prime is 681517417849. The next prime is 681517417913. The reversal of 681517417850 is 58714715186.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 545377819009 + 136139598841 = 738497^2 + 368971^2 .

It is a junction number, because it is equal to n+sod(n) for n = 681517417792 and 681517417801.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6815174129 + ... + 6815174228.

Almost surely, 2^681517417850 is an apocalyptic number.

681517417850 is a deficient number, since it is larger than the sum of its proper divisors (586104979444).

681517417850 is a wasteful number, since it uses less digits than its factorization.

681517417850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13630348369 (or 13630348364 counting only the distinct ones).

The product of its (nonzero) digits is 1881600, while the sum is 53.

The spelling of 681517417850 in words is "six hundred eighty-one billion, five hundred seventeen million, four hundred seventeen thousand, eight hundred fifty".