678856686419 has 2 divisors, whose sum is σ = 678856686420. Its totient is φ = 678856686418.

The previous prime is 678856686401. The next prime is 678856686523. The reversal of 678856686419 is 914686658876.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-678856686419 is a prime.

It is a super-2 number, since 2×678856686419² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (678856686119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339428343209 + 339428343210.

It is an arithmetic number, because the mean of its divisors is an integer number (339428343210).

Almost surely, 2^678856686419 is an apocalyptic number.

678856686419 is a deficient number, since it is larger than the sum of its proper divisors (1).

678856686419 is an equidigital number, since it uses as much as digits as its factorization.

678856686419 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 836075520, while the sum is 74.

The spelling of 678856686419 in words is "six hundred seventy-eight billion, eight hundred fifty-six million, six hundred eighty-six thousand, four hundred nineteen".