681209486911 has 16 divisors (see below), whose sum is σ = 705428105760. Its totient is φ = 657460177920.

The previous prime is 681209486897. The next prime is 681209486939. The reversal of 681209486911 is 119684902186.

It is a cyclic number.

It is not a de Polignac number, because 681209486911 - 2¹¹ = 681209484863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681209486941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1234071 + ... + 1698631.

It is an arithmetic number, because the mean of its divisors is an integer number (44089256610).

Almost surely, 2^681209486911 is an apocalyptic number.

681209486911 is a deficient number, since it is larger than the sum of its proper divisors (24218618849).

681209486911 is a wasteful number, since it uses less digits than its factorization.

681209486911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465066.

The product of its (nonzero) digits is 1492992, while the sum is 55.

The spelling of 681209486911 in words is "six hundred eighty-one billion, two hundred nine million, four hundred eighty-six thousand, nine hundred eleven".