685218033 has 12 divisors (see below), whose sum is σ = 1041852240. Its totient is φ = 432769176.

The previous prime is 685217999. The next prime is 685218041. The reversal of 685218033 is 330812586.

It is not a de Polignac number, because 685218033 - 2¹⁸ = 684955889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (685218043) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2003391 + ... + 2003732.

It is an arithmetic number, because the mean of its divisors is an integer number (86821020).

Almost surely, 2^685218033 is an apocalyptic number.

It is an amenable number.

685218033 is a deficient number, since it is larger than the sum of its proper divisors (356634207).

685218033 is a wasteful number, since it uses less digits than its factorization.

685218033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4007148 (or 4007145 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 685218033 is about 26176.6696315631. The cubic root of 685218033 is about 881.6094998012.

The spelling of 685218033 in words is "six hundred eighty-five million, two hundred eighteen thousand, thirty-three".