685163233 has 2 divisors, whose sum is σ = 685163234. Its totient is φ = 685163232.

The previous prime is 685163231. The next prime is 685163243. The reversal of 685163233 is 332361586.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 670965409 + 14197824 = 25903^2 + 3768^2 .

It is a cyclic number.

It is not a de Polignac number, because 685163233 - 2¹ = 685163231 is a prime.

Together with 685163231, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 685163192 and 685163201.

It is not a weakly prime, because it can be changed into another prime (685163231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342581616 + 342581617.

It is an arithmetic number, because the mean of its divisors is an integer number (342581617).

Almost surely, 2^685163233 is an apocalyptic number.

It is an amenable number.

685163233 is a deficient number, since it is larger than the sum of its proper divisors (1).

685163233 is an equidigital number, since it uses as much as digits as its factorization.

685163233 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 37.

The square root of 685163233 is about 26175.6228770205. The cubic root of 685163233 is about 881.5859970686.

The spelling of 685163233 in words is "six hundred eighty-five million, one hundred sixty-three thousand, two hundred thirty-three".