681664337463 has 16 divisors (see below), whose sum is σ = 924924404096. Its totient is φ = 446459951520.

The previous prime is 681664337443. The next prime is 681664337477. The reversal of 681664337463 is 364733466186.

It is not a de Polignac number, because 681664337463 - 2⁶ = 681664337399 is a prime.

It is a super-3 number, since 3×681664337463³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681664337443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4471093 + ... + 4621038.

It is an arithmetic number, because the mean of its divisors is an integer number (57807775256).

Almost surely, 2^681664337463 is an apocalyptic number.

681664337463 is a deficient number, since it is larger than the sum of its proper divisors (243260066633).

681664337463 is a wasteful number, since it uses less digits than its factorization.

681664337463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9092574.

The product of its digits is 31352832, while the sum is 57.

The spelling of 681664337463 in words is "six hundred eighty-one billion, six hundred sixty-four million, three hundred thirty-seven thousand, four hundred sixty-three".