678366551 has 2 divisors, whose sum is σ = 678366552. Its totient is φ = 678366550.

The previous prime is 678366539. The next prime is 678366569. The reversal of 678366551 is 155663876.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 678366551 - 2¹⁸ = 678104407 is a prime.

It is a Chen prime.

It is equal to p_35189669 and since 678366551 and 35189669 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 678366496 and 678366505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678366751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339183275 + 339183276.

It is an arithmetic number, because the mean of its divisors is an integer number (339183276).

Almost surely, 2^678366551 is an apocalyptic number.

678366551 is a deficient number, since it is larger than the sum of its proper divisors (1).

678366551 is an equidigital number, since it uses as much as digits as its factorization.

678366551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 907200, while the sum is 47.

The square root of 678366551 is about 26045.4708346768. The cubic root of 678366551 is about 878.6612525280.

The spelling of 678366551 in words is "six hundred seventy-eight million, three hundred sixty-six thousand, five hundred fifty-one".