687643396537 has 16 divisors (see below), whose sum is σ = 732295406592. Its totient is φ = 643461940480.

The previous prime is 687643396501. The next prime is 687643396589. The reversal of 687643396537 is 735693346786.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687643396537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687643396637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6136503 + ... + 6247555.

It is an arithmetic number, because the mean of its divisors is an integer number (45768462912).

Almost surely, 2^687643396537 is an apocalyptic number.

It is an amenable number.

687643396537 is a deficient number, since it is larger than the sum of its proper divisors (44652010055).

687643396537 is a wasteful number, since it uses less digits than its factorization.

687643396537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113168.

The product of its digits is 411505920, while the sum is 67.

The spelling of 687643396537 in words is "six hundred eighty-seven billion, six hundred forty-three million, three hundred ninety-six thousand, five hundred thirty-seven".