686673643 has 2 divisors, whose sum is σ = 686673644. Its totient is φ = 686673642.

The previous prime is 686673607. The next prime is 686673721. The reversal of 686673643 is 346376686.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 686673643 - 2⁹ = 686673131 is a prime.

It is not a weakly prime, because it can be changed into another prime (686673443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343336821 + 343336822.

It is an arithmetic number, because the mean of its divisors is an integer number (343336822).

Almost surely, 2^686673643 is an apocalyptic number.

686673643 is a deficient number, since it is larger than the sum of its proper divisors (1).

686673643 is an equidigital number, since it uses as much as digits as its factorization.

686673643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2612736, while the sum is 49.

The square root of 686673643 is about 26204.4584565299. The cubic root of 686673643 is about 882.2333265356.

The spelling of 686673643 in words is "six hundred eighty-six million, six hundred seventy-three thousand, six hundred forty-three".