678642911 has 2 divisors, whose sum is σ = 678642912. Its totient is φ = 678642910.

The previous prime is 678642883. The next prime is 678642929. The reversal of 678642911 is 119246876.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-678642911 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678642971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339321455 + 339321456.

It is an arithmetic number, because the mean of its divisors is an integer number (339321456).

Almost surely, 2^678642911 is an apocalyptic number.

678642911 is a deficient number, since it is larger than the sum of its proper divisors (1).

678642911 is an equidigital number, since it uses as much as digits as its factorization.

678642911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 44.

The square root of 678642911 is about 26050.7756314471. The cubic root of 678642911 is about 878.7805557060.

The spelling of 678642911 in words is "six hundred seventy-eight million, six hundred forty-two thousand, nine hundred eleven".