678416947469 has 2 divisors, whose sum is σ = 678416947470. Its totient is φ = 678416947468.

The previous prime is 678416947399. The next prime is 678416947501. The reversal of 678416947469 is 964749614876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 551249821444 + 127167126025 = 742462^2 + 356605^2 .

It is a cyclic number.

It is not a de Polignac number, because 678416947469 - 2⁸ = 678416947213 is a prime.

It is a super-2 number, since 2×678416947469² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678416947669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339208473734 + 339208473735.

It is an arithmetic number, because the mean of its divisors is an integer number (339208473735).

Almost surely, 2^678416947469 is an apocalyptic number.

It is an amenable number.

678416947469 is a deficient number, since it is larger than the sum of its proper divisors (1).

678416947469 is an equidigital number, since it uses as much as digits as its factorization.

678416947469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 438939648, while the sum is 71.

The spelling of 678416947469 in words is "six hundred seventy-eight billion, four hundred sixteen million, nine hundred forty-seven thousand, four hundred sixty-nine".