685648433 has 2 divisors, whose sum is σ = 685648434. Its totient is φ = 685648432.

The previous prime is 685648409. The next prime is 685648463. The reversal of 685648433 is 334846586.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 580954609 + 104693824 = 24103^2 + 10232^2 .

It is a cyclic number.

It is not a de Polignac number, because 685648433 - 2¹⁶ = 685582897 is a prime.

It is a super-2 number, since 2×685648433² = 940227547350710978, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (685648463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342824216 + 342824217.

It is an arithmetic number, because the mean of its divisors is an integer number (342824217).

Almost surely, 2^685648433 is an apocalyptic number.

It is an amenable number.

685648433 is a deficient number, since it is larger than the sum of its proper divisors (1).

685648433 is an equidigital number, since it uses as much as digits as its factorization.

685648433 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1658880, while the sum is 47.

The square root of 685648433 is about 26184.8894020960. The cubic root of 685648433 is about 881.7940470510.

The spelling of 685648433 in words is "six hundred eighty-five million, six hundred forty-eight thousand, four hundred thirty-three".