678488279657 has 2 divisors, whose sum is σ = 678488279658. Its totient is φ = 678488279656.

The previous prime is 678488279593. The next prime is 678488279671. The reversal of 678488279657 is 756972884876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 646240739881 + 32247539776 = 803891^2 + 179576^2 .

It is a cyclic number.

It is not a de Polignac number, because 678488279657 - 2⁶ = 678488279593 is a prime.

It is not a weakly prime, because it can be changed into another prime (678488279687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339244139828 + 339244139829.

It is an arithmetic number, because the mean of its divisors is an integer number (339244139829).

Almost surely, 2^678488279657 is an apocalyptic number.

It is an amenable number.

678488279657 is a deficient number, since it is larger than the sum of its proper divisors (1).

678488279657 is an equidigital number, since it uses as much as digits as its factorization.

678488279657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2275983360, while the sum is 77.

The spelling of 678488279657 in words is "six hundred seventy-eight billion, four hundred eighty-eight million, two hundred seventy-nine thousand, six hundred fifty-seven".