686624443 has 2 divisors, whose sum is σ = 686624444. Its totient is φ = 686624442.

The previous prime is 686624437. The next prime is 686624447. The reversal of 686624443 is 344426686.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 686624443 - 2¹³ = 686616251 is a prime.

It is equal to p_35595709 and since 686624443 and 35595709 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 686624443.

It is not a weakly prime, because it can be changed into another prime (686624447) 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 as a sum of consecutive naturals, namely, 343312221 + 343312222.

It is an arithmetic number, because the mean of its divisors is an integer number (343312222).

Almost surely, 2^686624443 is an apocalyptic number.

686624443 is a deficient number, since it is larger than the sum of its proper divisors (1).

686624443 is an equidigital number, since it uses as much as digits as its factorization.

686624443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 663552, while the sum is 43.

The square root of 686624443 is about 26203.5196681667. The cubic root of 686624443 is about 882.2122554311.

The spelling of 686624443 in words is "six hundred eighty-six million, six hundred twenty-four thousand, four hundred forty-three".