685929940189 has 8 divisors (see below), whose sum is σ = 738700931192. Its totient is φ = 633159970560.

The previous prime is 685929940117. The next prime is 685929940253. The reversal of 685929940189 is 981049929586.

It can be written as a sum of positive squares in 4 ways, for example, as 196116122500 + 489813817689 = 442850^2 + 699867^2 .

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

It is not a de Polignac number, because 685929940189 - 2¹³ = 685929931997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685929946189) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1686409 + ... + 2053249.

It is an arithmetic number, because the mean of its divisors is an integer number (92337616399).

Almost surely, 2^685929940189 is an apocalyptic number.

It is an amenable number.

685929940189 is a deficient number, since it is larger than the sum of its proper divisors (52770991003).

685929940189 is a wasteful number, since it uses less digits than its factorization.

685929940189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510687.

The product of its (nonzero) digits is 100776960, while the sum is 70.

The spelling of 685929940189 in words is "six hundred eighty-five billion, nine hundred twenty-nine million, nine hundred forty thousand, one hundred eighty-nine".