681853480891 has 24 divisors (see below), whose sum is σ = 777847526064. Its totient is φ = 592717551360.

The previous prime is 681853480853. The next prime is 681853480921. The reversal of 681853480891 is 198084358186.

It is a de Polignac number, because none of the positive numbers 2^k-681853480891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681853480591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18934495 + ... + 18970471.

It is an arithmetic number, because the mean of its divisors is an integer number (32410313586).

Almost surely, 2^681853480891 is an apocalyptic number.

681853480891 is a deficient number, since it is larger than the sum of its proper divisors (95994045173).

681853480891 is a wasteful number, since it uses less digits than its factorization.

681853480891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39291 (or 39268 counting only the distinct ones).

The product of its (nonzero) digits is 13271040, while the sum is 61.

The spelling of 681853480891 in words is "six hundred eighty-one billion, eight hundred fifty-three million, four hundred eighty thousand, eight hundred ninety-one".