678895667845 has 8 divisors (see below), whose sum is σ = 862596848664. Its totient is φ = 511168502784.

The previous prime is 678895667837. The next prime is 678895667851. The reversal of 678895667845 is 548766598876.

It can be written as a sum of positive squares in 4 ways, for example, as 257205179716 + 421690488129 = 507154^2 + 649377^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 678895667845 - 2³ = 678895667837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3993503844 + ... + 3993504013.

It is an arithmetic number, because the mean of its divisors is an integer number (107824606083).

Almost surely, 2^678895667845 is an apocalyptic number.

It is an amenable number.

678895667845 is a deficient number, since it is larger than the sum of its proper divisors (183701180819).

678895667845 is a wasteful number, since it uses less digits than its factorization.

678895667845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7987007879.

The product of its digits is 4877107200, while the sum is 79.

The spelling of 678895667845 in words is "six hundred seventy-eight billion, eight hundred ninety-five million, six hundred sixty-seven thousand, eight hundred forty-five".