1678812643 has 2 divisors, whose sum is σ = 1678812644. Its totient is φ = 1678812642.

The previous prime is 1678812617. The next prime is 1678812649. The reversal of 1678812643 is 3462188761.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1678812643 - 2²⁵ = 1645258211 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1678812593 and 1678812602.

It is not a weakly prime, because it can be changed into another prime (1678812649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 839406321 + 839406322.

It is an arithmetic number, because the mean of its divisors is an integer number (839406322).

Almost surely, 2^1678812643 is an apocalyptic number.

1678812643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1678812643 is an equidigital number, since it uses as much as digits as its factorization.

1678812643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 46.

The square root of 1678812643 is about 40973.3162314207. The cubic root of 1678812643 is about 1188.5042627487.

The spelling of 1678812643 in words is "one billion, six hundred seventy-eight million, eight hundred twelve thousand, six hundred forty-three".