685996699587 has 16 divisors (see below), whose sum is σ = 919583815680. Its totient is φ = 454871050400.

The previous prime is 685996699547. The next prime is 685996699601. The reversal of 685996699587 is 785996699586.

It is a cyclic number.

It is not a de Polignac number, because 685996699587 - 2⁸ = 685996699331 is a prime.

It is not an unprimeable number, because it can be changed into a prime (685996699547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4059412 + ... + 4225022.

It is an arithmetic number, because the mean of its divisors is an integer number (57473988480).

Almost surely, 2^685996699587 is an apocalyptic number.

685996699587 is a deficient number, since it is larger than the sum of its proper divisors (233587116093).

685996699587 is a wasteful number, since it uses less digits than its factorization.

685996699587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173034.

The product of its digits is 15872371200, while the sum is 87.

Subtracting 685996699587 from its reverse (785996699586), we obtain a palindrome (99999999999).

The spelling of 685996699587 in words is "six hundred eighty-five billion, nine hundred ninety-six million, six hundred ninety-nine thousand, five hundred eighty-seven".