678445290851329 has 4 divisors (see below), whose sum is σ = 678899708328276. Its totient is φ = 677990873374384.

The previous prime is 678445290851323. The next prime is 678445290851371. The reversal of 678445290851329 is 923158092544876.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 627745408303104 + 50699882548225 = 25054848^2 + 7120385^2 .

It is a cyclic number.

It is not a de Polignac number, because 678445290851329 - 2³⁷ = 678307851897857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678445290851323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 227208736234 + ... + 227208739219.

It is an arithmetic number, because the mean of its divisors is an integer number (169724927082069).

It is a 1-persistent number, because it is pandigital, but 2⋅678445290851329 = 1356890581702658 is not.

Almost surely, 2^{678445290851329} is an apocalyptic number.

It is an amenable number.

678445290851329 is a deficient number, since it is larger than the sum of its proper divisors (454417476947).

678445290851329 is a wasteful number, since it uses less digits than its factorization.

678445290851329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454417476946.

The product of its (nonzero) digits is 1045094400, while the sum is 73.

The spelling of 678445290851329 in words is "six hundred seventy-eight trillion, four hundred forty-five billion, two hundred ninety million, eight hundred fifty-one thousand, three hundred twenty-nine".