685563396729 has 16 divisors (see below), whose sum is σ = 918723220800. Its totient is φ = 454728770496.

The previous prime is 685563396671. The next prime is 685563396757. The reversal of 685563396729 is 927693365586.

It is not a de Polignac number, because 685563396729 - 2¹⁹ = 685562872441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (685563396229) 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, 262234 + ... + 1199955.

It is an arithmetic number, because the mean of its divisors is an integer number (57420201300).

Almost surely, 2^685563396729 is an apocalyptic number.

It is an amenable number.

685563396729 is a deficient number, since it is larger than the sum of its proper divisors (233159824071).

685563396729 is a wasteful number, since it uses less digits than its factorization.

685563396729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1462984.

The product of its digits is 440899200, while the sum is 69.

The spelling of 685563396729 in words is "six hundred eighty-five billion, five hundred sixty-three million, three hundred ninety-six thousand, seven hundred twenty-nine".