681964508536 has 32 divisors (see below), whose sum is σ = 1319432042880. Its totient is φ = 330237376000.

The previous prime is 681964508531. The next prime is 681964508579. The reversal of 681964508536 is 635805469186.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681964508531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7543240 + ... + 7633111.

It is an arithmetic number, because the mean of its divisors is an integer number (41232251340).

Almost surely, 2^681964508536 is an apocalyptic number.

It is an amenable number.

681964508536 is a deficient number, since it is larger than the sum of its proper divisors (637467534344).

681964508536 is a wasteful number, since it uses less digits than its factorization.

681964508536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15176535 (or 15176531 counting only the distinct ones).

The product of its (nonzero) digits is 37324800, while the sum is 61.

The spelling of 681964508536 in words is "six hundred eighty-one billion, nine hundred sixty-four million, five hundred eight thousand, five hundred thirty-six".