681398865763 has 32 divisors (see below), whose sum is σ = 877330132992. Its totient is φ = 513604195200.

The previous prime is 681398865761. The next prime is 681398865809. The reversal of 681398865763 is 367568893186.

It is a cyclic number.

It is not a de Polignac number, because 681398865763 - 2¹ = 681398865761 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 681398865692 and 681398865701.

It is not an unprimeable number, because it can be changed into a prime (681398865761) 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, 5411145 + ... + 5535637.

It is an arithmetic number, because the mean of its divisors is an integer number (27416566656).

Almost surely, 2^681398865763 is an apocalyptic number.

681398865763 is a deficient number, since it is larger than the sum of its proper divisors (195931267229).

681398865763 is a wasteful number, since it uses less digits than its factorization.

681398865763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126835.

The product of its digits is 313528320, while the sum is 70.

The spelling of 681398865763 in words is "six hundred eighty-one billion, three hundred ninety-eight million, eight hundred sixty-five thousand, seven hundred sixty-three".