678663735863 has 2 divisors, whose sum is σ = 678663735864. Its totient is φ = 678663735862.

The previous prime is 678663735839. The next prime is 678663735913. The reversal of 678663735863 is 368537366876.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-678663735863 is a prime.

It is a super-3 number, since 3×678663735863³ (a number of 36 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 678663735793 and 678663735802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678663735803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339331867931 + 339331867932.

It is an arithmetic number, because the mean of its divisors is an integer number (339331867932).

Almost surely, 2^678663735863 is an apocalyptic number.

678663735863 is a deficient number, since it is larger than the sum of its proper divisors (1).

678663735863 is an equidigital number, since it uses as much as digits as its factorization.

678663735863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 548674560, while the sum is 68.

The spelling of 678663735863 in words is "six hundred seventy-eight billion, six hundred sixty-three million, seven hundred thirty-five thousand, eight hundred sixty-three".