678239240617 has 4 divisors (see below), whose sum is σ = 678437966340. Its totient is φ = 678040514896.

The previous prime is 678239240587. The next prime is 678239240629. The reversal of 678239240617 is 716042932876.

678239240617 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 624201124096 + 54038116521 = 790064^2 + 232461^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-678239240617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678239240677) 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, 99357742 + ... + 99364567.

It is an arithmetic number, because the mean of its divisors is an integer number (169609491585).

Almost surely, 2^678239240617 is an apocalyptic number.

It is an amenable number.

678239240617 is a deficient number, since it is larger than the sum of its proper divisors (198725723).

678239240617 is a wasteful number, since it uses less digits than its factorization.

678239240617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198725722.

The product of its (nonzero) digits is 6096384, while the sum is 55.

The spelling of 678239240617 in words is "six hundred seventy-eight billion, two hundred thirty-nine million, two hundred forty thousand, six hundred seventeen".