681563427767 has 8 divisors (see below), whose sum is σ = 698867018160. Its totient is φ = 664457592960.

The previous prime is 681563427737. The next prime is 681563427773. The reversal of 681563427767 is 767724365186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 681563427767 - 2⁸ = 681563427511 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 (681563427737) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49431917 + ... + 49445702.

It is an arithmetic number, because the mean of its divisors is an integer number (87358377270).

Almost surely, 2^681563427767 is an apocalyptic number.

681563427767 is a deficient number, since it is larger than the sum of its proper divisors (17303590393).

681563427767 is a wasteful number, since it uses less digits than its factorization.

681563427767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98877793.

The product of its digits is 71124480, while the sum is 62.

The spelling of 681563427767 in words is "six hundred eighty-one billion, five hundred sixty-three million, four hundred twenty-seven thousand, seven hundred sixty-seven".