1678945727 has 2 divisors, whose sum is σ = 1678945728. Its totient is φ = 1678945726.

The previous prime is 1678945717. The next prime is 1678945729. The reversal of 1678945727 is 7275498761.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1678945727 - 2¹⁶ = 1678880191 is a prime.

Together with 1678945729, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1678945729) 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, 839472863 + 839472864.

It is an arithmetic number, because the mean of its divisors is an integer number (839472864).

Almost surely, 2^1678945727 is an apocalyptic number.

1678945727 is a deficient number, since it is larger than the sum of its proper divisors (1).

1678945727 is an equidigital number, since it uses as much as digits as its factorization.

1678945727 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5927040, while the sum is 56.

The square root of 1678945727 is about 40974.9402318051. The cubic root of 1678945727 is about 1188.5356672303.

The spelling of 1678945727 in words is "one billion, six hundred seventy-eight million, nine hundred forty-five thousand, seven hundred twenty-seven".