681023866845 has 32 divisors (see below), whose sum is σ = 1245769982208. Its totient is φ = 311207897088.

The previous prime is 681023866811. The next prime is 681023866849. The reversal of 681023866845 is 548668320186.

It is not a de Polignac number, because 681023866845 - 2⁷ = 681023866717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681023866849) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 941554 + ... + 1499523.

It is an arithmetic number, because the mean of its divisors is an integer number (38930311944).

Almost surely, 2^681023866845 is an apocalyptic number.

It is an amenable number.

681023866845 is a deficient number, since it is larger than the sum of its proper divisors (564746115363).

681023866845 is a wasteful number, since it uses less digits than its factorization.

681023866845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2443749.

The product of its (nonzero) digits is 13271040, while the sum is 57.

The spelling of 681023866845 in words is "six hundred eighty-one billion, twenty-three million, eight hundred sixty-six thousand, eight hundred forty-five".