685080018 has 80 divisors (see below), whose sum is σ = 1760451264. Its totient is φ = 195060960.

The previous prime is 685080013. The next prime is 685080023. The reversal of 685080018 is 810080586.

It is an interprime number because it is at equal distance from previous prime (685080013) and next prime (685080023).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (685080013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 392628 + ... + 394368.

Almost surely, 2^685080018 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685080018, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (880225632).

685080018 is an abundant number, since it is smaller than the sum of its proper divisors (1075371246).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

685080018 is a wasteful number, since it uses less digits than its factorization.

685080018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2109 (or 2100 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 36.

The square root of 685080018 is about 26174.0332772769. The cubic root of 685080018 is about 881.5503052580.

It can be divided in two parts, 6850 and 80018, that added together give a palindrome (86868).

The spelling of 685080018 in words is "six hundred eighty-five million, eighty thousand, eighteen".