685191426605 has 16 divisors (see below), whose sum is σ = 941620673280. Its totient is φ = 468880762752.

The previous prime is 685191426587. The next prime is 685191426641. The reversal of 685191426605 is 506624191586.

It is a cyclic number.

It is not a de Polignac number, because 685191426605 - 2²⁶ = 685124317741 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20082440 + ... + 20116529.

It is an arithmetic number, because the mean of its divisors is an integer number (58851292080).

Almost surely, 2^685191426605 is an apocalyptic number.

It is an amenable number.

685191426605 is a deficient number, since it is larger than the sum of its proper divisors (256429246675).

685191426605 is a wasteful number, since it uses less digits than its factorization.

685191426605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40199468.

The product of its (nonzero) digits is 3110400, while the sum is 53.

The spelling of 685191426605 in words is "six hundred eighty-five billion, one hundred ninety-one million, four hundred twenty-six thousand, six hundred five".