685851731357 has 8 divisors (see below), whose sum is σ = 740969336184. Its totient is φ = 631071237888.

The previous prime is 685851731321. The next prime is 685851731407. The reversal of 685851731357 is 753137158586.

It can be written as a sum of positive squares in 4 ways, for example, as 48758822596 + 637092908761 = 220814^2 + 798181^2 .

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

It is not a de Polignac number, because 685851731357 - 2³² = 681556764061 is a prime.

It is a super-2 number, since 2×685851731357² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 685851731296 and 685851731305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685851731057) 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, 84273608 + ... + 84281745.

It is an arithmetic number, because the mean of its divisors is an integer number (92621167023).

Almost surely, 2^685851731357 is an apocalyptic number.

It is an amenable number.

685851731357 is a deficient number, since it is larger than the sum of its proper divisors (55117604827).

685851731357 is a wasteful number, since it uses less digits than its factorization.

685851731357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168555679.

The product of its digits is 21168000, while the sum is 59.

The spelling of 685851731357 in words is "six hundred eighty-five billion, eight hundred fifty-one million, seven hundred thirty-one thousand, three hundred fifty-seven".