681853367245 has 16 divisors (see below), whose sum is σ = 840385998000. Its totient is φ = 530709732864.

The previous prime is 681853367231. The next prime is 681853367309. The reversal of 681853367245 is 542763358186.

It is a happy number.

681853367245 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 87494090436 + 594359276809 = 295794^2 + 770947^2 .

It is a cyclic number.

It is not a de Polignac number, because 681853367245 - 2¹¹ = 681853365197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 681853367245.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3488881 + ... + 3679129.

It is an arithmetic number, because the mean of its divisors is an integer number (52524124875).

Almost surely, 2^681853367245 is an apocalyptic number.

It is an amenable number.

681853367245 is a deficient number, since it is larger than the sum of its proper divisors (158532630755).

681853367245 is a wasteful number, since it uses less digits than its factorization.

681853367245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209664.

The product of its digits is 29030400, while the sum is 58.

The spelling of 681853367245 in words is "six hundred eighty-one billion, eight hundred fifty-three million, three hundred sixty-seven thousand, two hundred forty-five".