678583220017 has 4 divisors (see below), whose sum is σ = 718499880036. Its totient is φ = 638666560000.

The previous prime is 678583219927. The next prime is 678583220039. The reversal of 678583220017 is 710022385876.

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 470244833536 + 208338386481 = 685744^2 + 456441^2 .

It is a cyclic number.

It is not a de Polignac number, because 678583220017 - 2⁷ = 678583219889 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678583280017) 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, 19958329984 + ... + 19958330017.

It is an arithmetic number, because the mean of its divisors is an integer number (179624970009).

Almost surely, 2^678583220017 is an apocalyptic number.

It is an amenable number.

678583220017 is a deficient number, since it is larger than the sum of its proper divisors (39916660019).

678583220017 is a wasteful number, since it uses less digits than its factorization.

678583220017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39916660018.

The product of its (nonzero) digits is 1128960, while the sum is 49.

The spelling of 678583220017 in words is "six hundred seventy-eight billion, five hundred eighty-three million, two hundred twenty thousand, seventeen".