685207506791 has 8 divisors (see below), whose sum is σ = 744537868800. Its totient is φ = 628203825720.

The previous prime is 685207506787. The next prime is 685207506811. The reversal of 685207506791 is 197605702586.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 685207506791 - 2² = 685207506787 is a prime.

It is a super-2 number, since 2×685207506791² (a number of 24 digits) contains 22 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 (685207503791) 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 7 ways as a sum of consecutive naturals, for example, 581669621 + ... + 581670798.

It is an arithmetic number, because the mean of its divisors is an integer number (93067233600).

Almost surely, 2^685207506791 is an apocalyptic number.

685207506791 is a deficient number, since it is larger than the sum of its proper divisors (59330362009).

685207506791 is a wasteful number, since it uses less digits than its factorization.

685207506791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1163340469.

The product of its (nonzero) digits is 6350400, while the sum is 56.

The spelling of 685207506791 in words is "six hundred eighty-five billion, two hundred seven million, five hundred six thousand, seven hundred ninety-one".