681185507841 has 8 divisors (see below), whose sum is σ = 1009163715360. Its totient is φ = 454123671876.

The previous prime is 681185507837. The next prime is 681185507843. The reversal of 681185507841 is 148705581186.

681185507841 is a `hidden beast` number, since 6 + 8 + 1 + 1 + 8 + 550 + 7 + 84 + 1 = 666.

681185507841 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 681185507841 - 2² = 681185507837 is a prime.

It is not an unprimeable number, because it can be changed into a prime (681185507843) 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, 12614546415 + ... + 12614546468.

It is an arithmetic number, because the mean of its divisors is an integer number (126145464420).

Almost surely, 2^681185507841 is an apocalyptic number.

It is an amenable number.

681185507841 is a deficient number, since it is larger than the sum of its proper divisors (327978207519).

681185507841 is a wasteful number, since it uses less digits than its factorization.

681185507841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25229092892 (or 25229092886 counting only the distinct ones).

The product of its (nonzero) digits is 2150400, while the sum is 54.

The spelling of 681185507841 in words is "six hundred eighty-one billion, one hundred eighty-five million, five hundred seven thousand, eight hundred forty-one".