678125258817 has 4 divisors (see below), whose sum is σ = 904167011760. Its totient is φ = 452083505876.

The previous prime is 678125258813. The next prime is 678125258891. The reversal of 678125258817 is 718852521876.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 678125258817 - 2² = 678125258813 is a prime.

It is not an unprimeable number, because it can be changed into a prime (678125258813) 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, 113020876467 + ... + 113020876472.

It is an arithmetic number, because the mean of its divisors is an integer number (226041752940).

Almost surely, 2^678125258817 is an apocalyptic number.

It is an amenable number.

678125258817 is a deficient number, since it is larger than the sum of its proper divisors (226041752943).

678125258817 is a wasteful number, since it uses less digits than its factorization.

678125258817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226041752942.

The product of its digits is 15052800, while the sum is 60.

The spelling of 678125258817 in words is "six hundred seventy-eight billion, one hundred twenty-five million, two hundred fifty-eight thousand, eight hundred seventeen".