685647470899999 has 16 divisors (see below), whose sum is σ = 728942606925120. Its totient is φ = 643686158626560.

The previous prime is 685647470899991. The next prime is 685647470900017. The reversal of 685647470899999 is 999998074746586.

It is a cyclic number.

It is not a de Polignac number, because 685647470899999 - 2³ = 685647470899991 is a prime.

It is a super-2 number, since 2×685647470899999² (a number of 30 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 (685647470899991) 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, 209828214 + ... + 213070819.

It is an arithmetic number, because the mean of its divisors is an integer number (45558912932820).

Almost surely, 2^{685647470899999} is an apocalyptic number.

685647470899999 is a deficient number, since it is larger than the sum of its proper divisors (43295136025121).

685647470899999 is a wasteful number, since it uses less digits than its factorization.

685647470899999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422900610.

The product of its (nonzero) digits is 533311672320, while the sum is 100.

The spelling of 685647470899999 in words is "six hundred eighty-five trillion, six hundred forty-seven billion, four hundred seventy million, eight hundred ninety-nine thousand, nine hundred ninety-nine".