685187217253 has 32 divisors (see below), whose sum is σ = 878557593600. Its totient is φ = 529707714480.

The previous prime is 685187217251. The next prime is 685187217283. The reversal of 685187217253 is 352712781586.

It is a happy number.

It is not a de Polignac number, because 685187217253 - 2¹ = 685187217251 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 685187217194 and 685187217203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685187217251) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 235801 + ... + 1194142.

It is an arithmetic number, because the mean of its divisors is an integer number (27454924800).

Almost surely, 2^685187217253 is an apocalyptic number.

It is an amenable number.

685187217253 is a deficient number, since it is larger than the sum of its proper divisors (193370376347).

685187217253 is a wasteful number, since it uses less digits than its factorization.

685187217253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1430102 (or 1430088 counting only the distinct ones).

The product of its digits is 5644800, while the sum is 55.

The spelling of 685187217253 in words is "six hundred eighty-five billion, one hundred eighty-seven million, two hundred seventeen thousand, two hundred fifty-three".