678245909542807 has 2 divisors, whose sum is σ = 678245909542808. Its totient is φ = 678245909542806.

The previous prime is 678245909542769. The next prime is 678245909542847. The reversal of 678245909542807 is 708245909542876.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-678245909542807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678245909542847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339122954771403 + 339122954771404.

It is an arithmetic number, because the mean of its divisors is an integer number (339122954771404).

Almost surely, 2^{678245909542807} is an apocalyptic number.

678245909542807 is a deficient number, since it is larger than the sum of its proper divisors (1).

678245909542807 is an equidigital number, since it uses as much as digits as its factorization.

678245909542807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2438553600, while the sum is 76.

The spelling of 678245909542807 in words is "six hundred seventy-eight trillion, two hundred forty-five billion, nine hundred nine million, five hundred forty-two thousand, eight hundred seven".