681563427769 has 16 divisors (see below), whose sum is σ = 795579840000. Its totient is φ = 571711981824.

The previous prime is 681563427737. The next prime is 681563427773. The reversal of 681563427769 is 967724365186.

681563427769 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 681563427769 - 2⁵ = 681563427737 is a prime.

It is a super-2 number, since 2×681563427769² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 681563427769.

It is not an unprimeable number, because it can be changed into a prime (681563427709) 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, 3487357 + ... + 3677605.

It is an arithmetic number, because the mean of its divisors is an integer number (49723740000).

Almost surely, 2^681563427769 is an apocalyptic number.

It is an amenable number.

681563427769 is a deficient number, since it is larger than the sum of its proper divisors (114016412231).

681563427769 is a wasteful number, since it uses less digits than its factorization.

681563427769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201192.

The product of its digits is 91445760, while the sum is 64.

The spelling of 681563427769 in words is "six hundred eighty-one billion, five hundred sixty-three million, four hundred twenty-seven thousand, seven hundred sixty-nine".