681105536 has 32 divisors (see below), whose sum is σ = 1360134300. Its totient is φ = 339738624.

The previous prime is 681105511. The next prime is 681105539. The reversal of 681105536 is 635501186.

It can be written as a sum of positive squares in 2 ways, for example, as 678915136 + 2190400 = 26056^2 + 1480^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 681105496 and 681105505.

It is not an unprimeable number, because it can be changed into a prime (681105539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49280 + ... + 61568.

Almost surely, 2^681105536 is an apocalyptic number.

It is an amenable number.

681105536 is a deficient number, since it is larger than the sum of its proper divisors (679028764).

681105536 is a wasteful number, since it uses less digits than its factorization.

681105536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12736 (or 12724 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 681105536 is about 26097.9986972181. The cubic root of 681105536 is about 879.8422306694.

The spelling of 681105536 in words is "six hundred eighty-one million, one hundred five thousand, five hundred thirty-six".